An M416 Camping Trailer may look like this
We designed our Dinoot M-Series M416 camping trailer tub kits to have the same 40.5″ width that a M416 trailer has to be used as replacement tubs. This also makes them the same width as a Harbor Freight 40.5″ x 48″ frame kit. The Harbor Freight frames are perfectly sized for building a stubby 4′ M-Series M416.
Here are a few ideas on how you could build one.