i'm going to guess somebody put a
Burro label of some sort on an early
U-Haul trailer, a design that is indeed very similar to the Burro. As far as a wiring diagram, you might look at the Burro section and find the pdf of the original Owner's Manual available there. You will find a Burro wiring diagram in that which should be correct or at least adaptable to your
U-Haul. Unfortunately, I know of no such information specifically available for the
U-Haul. Plumbing was pretty rudimentary and should be the same for both. As far as the floor plan, since the cabinets, benches, etc. were moulded in and part of the structure of the trailer, all you need to worry about is what colors of carpet, curtains and cushion covers you want to use. How about in progress photos of your build?
Froggie