Modular Multi-Purpose Trailer Design

I need a full structural design for a customizable trailer that can alternate between carrying horses, general cargo, and a motorcycle. The core requirement is a modular frame and body that lets me install or remove interior and exterior components quickly, without specialized tools, so the same chassis serves multiple roles on short notice.

Key elements to accommodate:
• Removable partitions for safely transporting one or two horses.
• Bolt-on / slide-in motorcycle mounts that lock the bike securely to the deck.
• A detachable top section (roof and side panels) that can be lifted off and nested for compact storage when I only need a flat-bed or open cargo configuration.
. Easy to dismantle the whole trailer for storage.

I am open to material suggestions—steel, aluminum, or a hybrid—so long as you provide weight, strength, and cost comparisons. Please include standard lighting, brake, and suspension considerations that comply with typical North American DOT regulations, and leave space for optional add-ons such as ramps or extra ventilation if I decide to upgrade later.

Deliverables I expect:
1. 3D CAD model (SolidWorks or similar) with all assemblies and exploded views.
2. Detailed fabrication drawings with dimensions, weld symbols, and material specs.
3. Basic structural calculations or FEA showing the design meets safe load limits for the three use-cases.
4. A short setup guide illustrating how each modular piece is installed or removed.

I will review drafts, provide quick feedback, and aim to move to fabrication as soon as the design passes my local registration checks. Let me know your timeline and any questions you have about clearances, axle rating, or hitch style so we can get started right away.