A utility trailer, as for example may be towed behind a vehicle, is disclosed. A description of the assembly, reconfiguration, expandability and folding of the trailer is described. The trailer is easy to store, manufacture, reconfigure and disassemble in large measure due to the unique repeated nature of the main frame components. The frame components can also be removed from the trailer assembly and reconfiguring into different useful devices. The reconfiguration requires minimal additional hardware and is further simplified by the locking mechanisms, located at the connection locations of is each frame panel. The trailer/accessory system also offers advantages over other trailers in that it may be maintained by replacement of common panel components. The wheel assemblies are also collapsible to further reduce necessary storage space and shipping requirements.