Abstract: A modular wheel and suspension assembly (MWSA) to provide mobility to a load for towing. The MWSA can have a fender housing and a suspension arm and suspension mechanism that is rotated toward a pivot arm with a suspension mount that engages with the suspension mechanism and a wheel. The suspension arm can be rotatably attached to the fender housing. A linear actuator can rotate the suspension arm to raise the fender housing while deploying the wheel from the fender housing. Rotating the suspension arm in the opposite direction causes the fender housing to be lowered over the wheel and the load to be lowered as the wheel retracts into the fender housing. The MWSA can have a rotary tongue system with an operable connection to the suspension arm. Rotating the suspension arm lowers and raises a tongue when the wheel is deployed from or retracted into the fender housing.

Abstract: A panel for constructing a trailer floor is provided. The panel includes a platform from which a plurality of sidewalls extend from a first edge and a second edge, with slots therebetween for receiving cross members. The sidewalls engage with the cross members to inhibit movement of the sidewalls away from the slots, which simultaneously inhibits the panel from flexing. The inhibition of flexure of the panel increases the load carrying capacity of the panel, allowing utilization of lighter materials to achieve the same load carrying capacity as heavier materials.

Abstract: A system for positioning a trailer body with the trailer support surface at ground level. The system comprises one or more suspension systems for controlling the position of wheels on either side of the trailer body and a rotary tongue system that allows the trailer tongue to rotate relative to the trailer body.