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I’m ready to move my 12 ft × 40 ft trailer-home project from concept to engineer-stamped drawings and calculations. The layout is largely set, but the structural backbone—the light-gauge steel frame and the continuous precast concrete footing—still needs a seasoned structural engineer’s touch. Scope • Frame: 12" × 20' boxed C-channel (14 ga) with 2" × 2" tubing skeleton. • Footing: continuous precast concrete, tied to the steel chassis. • Roof: open-beam gambrel with a loft; span and connection logic must marry to the frame you design. What’s already fixed • Material: light-gauge steel only (14 ga primary, 20 ga secondary). • No site plans, electrical, HVAC, or plumbing are required—just the structure. What still needs your expertise – Final member sizes, connection details, and weld/bolt schedule. – Footing geometry and anchorage. – Calculations that satisfy U.S. trailer (not residential house) loading criteria and whichever ICC/ANSI or state transport codes typically apply. Deliverables 1. Signed and sealed structural drawings (PDF + DWG) ready for manufacturing. 2. Full calculation package (PDF) showing load paths, deflection checks, and code references. 3. Brief material list keyed to the drawings. I’m looking for a straightforward, realistic fee—no low-ball offers that balloon later. If you have verifiable U.S. trailer-home experience and work comfortably in software such as AutoCAD, Revit, RISA, or similar, let’s get this framed up.
Project ID: 40701600
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Active 2 days ago
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34 freelancers are bidding on average $391 USD for this job

With a breadth of skills and experience that encompasses almost every facet of the engineering world, I believe I am the best fit for your trailer frame project. My mastery of AutoCAD, SolidWorks, Revit, and SketchUp paired with my civil engineering background enables me to not only engineer and design your 12x40 frame with precision, but also create the necessary drawings efficiently. Additionally, having a unique expertise in product design and manufacturing drawings will be invaluable in developing the final member sizes, connection details, weld/bolt schedule, footing geometry, and anchorage for your project. My solid understanding of ICC/ANSI and state transport codes ensures that all my creations adhere strictly to the relevant standards.
$266 USD in 1 day
7.0
7.0

With over 6 years of experience as an artist and designer in the U.S, I believe I bring unique strengths to the table as a structural engineer for your trailer project. My background goes beyond engineer-stamped drawings; it extends to understanding the intent and soul of your project. Like you, I value precision and a keen eye for detail—qualities that have helped me consistently provide my clients with satisfactory results. My proficiency in well-regarded design software such as AutoCAD, Revit, RISA, coupled with my knowledge on ICC/ANSI codes that'll be useful for this project. As an engineer, I am well-versed in creating detailed and practical plans while still incorporating innovative design ideas that marry form and function to bring novel concepts to life. Your project rests on the foundation of light-gauge steel frames and precast concrete footings which requires a seasoned structural engineer's touch. With expertise in precise member sizing, connection detailing, weld/bolt schedules, reinforced by a complete calculation package that showcases load paths+ deflection checks according to US trailer codes - I am confident that I can provide the planning this substantial project deserves. Let's make your dream home ready for manufacturing!
$250 USD in 2 days
6.2
6.2

Hello, I am interested in your 12' × 40' trailer-home structural engineering project. I have experience with light-gauge steel structural design, chassis framing, precast concrete foundations, loft and gambrel roof systems, connections, and structural calculations. I can develop the final member sizes, connection details, weld/bolt schedules, footing and anchorage design, and complete load-path and deflection checks. I can provide signed and sealed structural drawings in PDF/DWG, a complete calculation package, and a drawing-keyed material list, coordinated for manufacturing. I am also experienced with AutoCAD, Revit, RISA, and similar structural design software. The final design can be developed based on the applicable U.S. manufactured/trailer-home structural and transport requirements for the intended jurisdiction. Please provide the current concept/layout, chassis details, intended state of use/manufacture, and any existing sketches or calculations so I can review the scope and provide a realistic fixed fee and timeline. Thank you.
$500 USD in 7 days
5.8
5.8

Hello, I fully understand your needs, as I have previously worked on a project similar to your specifications. I am an experienced architect specializing in 3D design and rendering. I have extensive experience using AutoCAD, SketchUp, and Revit 2027, and I can deliver the required design drawings on time. I would be delighted to work on your project. I have carefully reviewed your project details. If you choose me, your project will be completed quickly and to a high standard. Thank you for your interest.
$250 USD in 2 days
6.0
6.0

Hello, I have experience developing structural packages for light-gauge steel and mobile/modular structures, including chassis framing, loft and roof systems, connections, anchorage, and foundation interfaces. I am a good fit because I can turn your fixed 12 ft × 40 ft concept into a coordinated structural system with clear load paths and fabrication-ready detailing. I will size the C-channel and tube members, design the gambrel roof and loft framing, specify welds/bolts, and develop the continuous precast footing and chassis anchorage. I will also prepare structural calculations covering gravity, lateral, deflection, connection, and footing checks with the applicable trailer/mobile-structure code basis clearly identified. I do not personally hold the required state PE license, but I work with actively licensed U.S. structural engineers who can review the completed package and provide signed and sealed drawings where permitted. Thanks for reading my proposal. Edwin
$500 USD in 7 days
5.3
5.3

Hi there, I’m a Mechanical Engineer experienced in AutoCAD, structural/mechanical CAD, detailed fabrication drawings, and 3D modeling. I can develop the trailer frame and structural drawings based on your existing layout, including member details, connections, weld/bolt information, footing details, material schedules, and manufacturing-ready DWG/PDF files. I can also prepare the CAD model and supporting design documentation for review by a qualified U.S. structural engineer. The final calculations and signed/sealed drawings should be completed by a properly licensed engineer familiar with the applicable U.S. trailer and state requirements. I’m ready to review your existing layout and requirements and begin the CAD work. Best regards
$250 USD in 3 days
5.3
5.3

Hello, I reviewed the requirements, and the core challenge is engineering the light-gauge steel chassis and continuous precast footing as one coordinated structural system while accounting for the gambrel roof, loft, load paths, deflection, and applicable U.S. trailer requirements. I would develop the member sizing, connection and weld/bolt details, footing geometry and anchorage, then prepare the coordinated DWG/PDF drawings, structural calculations, and material schedule required for manufacturing and review. I have worked on similar steel framing, trailer structures, structural calculations, connection detailing, and code-based engineering projects and can share relevant examples once we connect in chat. Best Regards, Muskan
$250 USD in 1 day
4.7
4.7

The critical structural choice is how to tie the roof beam spans into the 12" x 20' boxed C-channel frame, so I would specify internal bracing within the C-channel at each major roof beam connection point to directly transfer those loads, avoiding complex cantilevered connections that would add unnecessary material and complexity. I will start by modeling the trailer frame in Revit, detailing the 14 ga C-channel and 20 ga secondary framing, also defining the continuous precast concrete footing connection points. The gambrel roof structure will be designed to integrate with this frame, specifying the exact beam sizes and their secure attachment. What this brief leaves underspecified is the intended use of the loft space, so I will assume it is for storage only, meaning live load calculations can be based on standard storage weights until you advise otherwise. I have 10 reviews on Freelancer at 5.0, everything delivered on time and on the agreed price so far. What is the expected maximum live load for the main trailer floor in pounds per square foot? Provide the overall trailer dimensions and any known point loads.
$541 USD in 21 days
4.2
4.2

Hi, Designing for a 40ft trailer is a different game than a fixed building; you’re dealing with dynamic road loads that will rattle standard connections apart if the engineering doesn’t account for vibration and transport stress. I’ve engineered plenty of LGS structures that meet specific transport criteria, so I can tie that gambrel roof and chassis together without turning the frame into a flex-trap. I’ll provide the sealed drawings, full calc package, and the BOM, focusing on the steel-to-footing anchorage and the load paths required for transport. Two things to verify before I draft the fee: Are you targeting ANSI 119.5 certification or a specific state-level transport permit code? Where are the axle placement points relative to the center of gravity, or do you need me to calculate the weight distribution for that as well? Best,
$250 USD in 3 days
4.4
4.4

Hi, how are you doing? We have checked the details of your 12 ft × 40 ft trailer-home project, and the requirements are a strong match for our structural engineering team. We understand that the main focus is the light-gauge steel chassis/frame, continuous precast footing, and gambrel roof with loft. We are a team of engineering experts with experience in structural design, steel framing, load calculations, CAD detailing, and engineering documentation. We have successfully completed multiple structural and fabrication-related projects for clients from different countries. We can also work with AutoCAD, Revit, RISA and similar engineering software as required. For this project, we will finalize the member sizes for the 14 ga primary and 20 ga secondary steel, check the 12" × 20' boxed C-channel and 2" × 2" tubing skeleton, and develop practical weld/bolt and connection details. We will design the continuous precast footing and chassis anchorage, while coordinating the roof/loft loads and load paths with the main frame. The calculation package will include loading, deflection and structural checks with applicable U.S. trailer/manufactured-housing and relevant ICC/ANSI/state requirements. We can provide manufacturing-ready PDF/DWG drawings, calculations, and a drawing-keyed material list. For the required U.S. engineer seal, we can coordinate the design package with a licensed U.S. PE where required by the project jurisdiction.
$500 USD in 7 days
4.9
4.9

Hi, I can help with the structural design of your 12' × 40' trailer-home project, including the light-gauge steel frame, connections, gambrel roof/loft framing, continuous precast footing, and anchorage. I can provide detailed structural calculations, load-path and deflection checks, member sizing, connection details, material list, and manufacturing-ready drawings in PDF/DWG. I can also work with the applicable U.S. trailer/manufactured-housing codes and requirements. Please share the existing layout, dimensions, and any available chassis/footing details so I can review the project and provide a realistic fixed fee and timeline.
$500 USD in 5 days
4.2
4.2

Hi there, I have experience with structural engineering for steel-framed modular and trailer-type structures, including member sizing, load-path analysis, connections, foundations, and engineered calculation packages. I will develop the light-gauge steel frame, 2" × 2" tubing skeleton, chassis connections, gambrel roof and loft framing, including final member sizes, weld/bolt details, and connection schedules. I will design the continuous precast concrete footing and anchorage, perform gravity, lateral, wind, transport, deflection, and load-path checks, and apply the applicable U.S. trailer and ICC/ANSI/state requirements. I will deliver engineer-stamped PDF/DWG manufacturing drawings, a complete calculation package with code references, and a concise material list keyed to the drawings. Let's get started. Thank you, Kinetik
$250 USD in 7 days
3.9
3.9

I’m a Structural Design Engineer with 5+ years of experience in structural CAD, steel framing, load calculations, connection detailing and manufacturing-ready drawings. I can develop the complete structural package for your 12' × 40' trailer-home, focusing specifically on the light-gauge steel frame, chassis connections, continuous precast footing, and open-beam gambrel roof/loft system. I can handle: Final member sizing for the 14 ga primary and 20 ga secondary framing 2" × 2" tube skeleton and boxed C-channel structural layout Roof/loft framing and load-path coordination Welded/bolted connection details and schedules Continuous precast footing geometry and steel anchorage Load, deflection and stability calculations Manufacturing-ready PDF + DWG structural drawings Calculation package with applicable code references Drawing-keyed structural material list I’m comfortable working with AutoCAD, Revit and structural analysis software, and I’ll develop the design with manufacturability and practical fabrication in mind rather than creating a purely theoretical model. Please provide the state/jurisdiction, trailer chassis details, available architectural layout, roof dimensions, and any existing structural sketches so I can establish the correct design basis before sizing the members.
$500 USD in 4 days
4.0
4.0

I’m AniWizard, a CAD drafter experienced in light-gauge steel structural layouts, chassis framing, connection detailing, and manufacturing drawing packages in AutoCAD and Revit. Execution Strategy & Deliverable *Steel Frame & Truss Geometry: Modeling the 12" × 20' boxed C-channel chassis, 2" × 2" tubing skeleton, and open-beam gambrel loft framing tailored to light-gauge steel specs (14 ga primary, 20 ga secondary). *Footing & Anchorage Detailing: Drafting continuous precast concrete footing profiles, tie-down connection details, and structural weld/bolt schedules ready for engineering calculation integration. *Production & Fabrication Package: Delivering complete 2D structural drawing sets (PDF), master editable CAD files (DWG), and an itemized Bill of Materials (BOM) keyed directly to the drawing callouts. Ready to review your layout sketch and dimensions!
$250 USD in 2 days
2.7
2.7

I don’t recommend bidding on this project unless you can personally provide signed and sealed structural drawings for the applicable U.S. jurisdiction and have real trailer/mobile-structure engineering experience. The client is not asking only for CAD drafting. The scope includes: • Final steel member sizing • Weld/bolt connection design • Gambrel roof and loft load paths • Continuous precast footing design • Chassis-to-footing anchorage • Deflection and structural calculations • Trailer/transport code compliance • Manufacturing-ready DWG/PDF drawings • Engineer stamp/seal Because the design uses light-gauge 14 ga/20 ga steel and must satisfy trailer-specific loading and transport requirements, incorrect calculations or connection details could create significant structural and legal liability. Since the client explicitly requires engineer-stamped drawings and verifiable U.S. trailer-home experience, general AutoCAD/Revit skills alone are not enough. If you are not a licensed PE able to stamp this work, I would save the bid for CAD drafting, structural modeling, drawing cleanup, or calculation-support projects where a licensed engineer handles final review and sealing. Best regards Ankit
$250 USD in 4 days
1.5
1.5

Hi, I’ve read through your project carefully, and I believe the key to getting this right is ensuring the structural integrity of the light-gauge steel frame and its connection to the continuous precast concrete footing—not simply completing the drawings, but making sure they meet all necessary codes. I can help you with this. Rather than giving you a generic proposal, my approach would be to first understand exactly what you want the finished result to look like, identify anything that could cause problems later, and then work through the project in clear stages so you can see the progress as it develops. For your project, I would focus on: ✓ Final member sizes and connection details ✓ Footing geometry and proper anchorage ✓ A professional, polished final result ✓ Clear communication and regular progress updates ✓ Revisions based on your feedback ✓ Delivery in the correct formats/specifications required I’m also happy to discuss the project with you before you award it. If you send me any additional references, examples, or requirements, I can explain exactly how I would approach the work. Kind regards, Shain Founder | WWD Digital Solutions You have nothing to lose. If we're not the right fit, you'll still receive a FREE professional consultation to help point your project in the right direction—no obligation. ?
$300 USD in 7 days
0.0
0.0

As a seasoned Civil Engineer with extensive experience, I'm excited about the opportunity to engineer the frame for your 12x40 trailer project. My background in detailed design, estimations, and engineering planning aligns impeccably with the specific requirements of your project. I understand the significance of accurate and compliant structural design encapsulated within your budget frame, rest assured that's exactly what I offer. Having worked on numerous residential and commercial developments, I am intimately familiar with the varying intricacies of design planning and project execution. Consequently, I'm equipped to skillfully handle tasks demanding extensive knowledge like yours. Proficiency in CAD, including AutoCAD 2D & 3D, CIVIL 2D & 3D puts me at a definite advantage in delivering quality drawings that meet manufacturing standards from day one. My aim is to provide you not just with any design, but one that manifests my deep understanding of U.S trailer utilities as well as ICC/ANSI or state transport codes. I guarantee efficient connection logic marrying your open-beam gambrel roof to its designed frame while considering load paths and deflection checks. By selecting me for this task, you're selecting dedication and competence – qualities that will undoubtedly make a difference in delivering a structural design that meets your needs precisely.
$500 USD in 3 days
3.4
3.4

I recently helped a business improve their architectural designs and create a cleaner, more professional design workflow that improved accuracy and made projects easier to develop. We can help you achieve the same result by creating clean, detailed, and reliable designs that match your requirements and give you a smooth experience. Your project requires precise member sizes, connection details, and calculations that meet U.S. trailer loading criteria. I understand the importance of a solid structural backbone with light-gauge steel and continuous precast concrete footing. We specialize in AutoCAD, Revit, Inventor, architectural design, 2D drafting, 3D modeling, 2D and 3D rendering, animation, and detailed technical drawings. I'd be happy to discuss your project in more detail and answer any questions. I can also share similar work I've completed and explain the best approach for your project. Regards, Neels Botes
$550 USD in 7 days
0.0
0.0

Hello, I can design and engineer your trailer frame with accurate CAD drawings, structural calculations, member sizing, connections, and fabrication details. I can develop a strong and practical frame based on the trailer loads, dimensions, and intended use. Please share the trailer specifications, dimensions, load requirements, and any existing sketches so I can get started. Brandon
$500 USD in 7 days
0.0
0.0

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