Whatever size you get, here are some other things youíll need.
Get more tie downs than you think you need. At least 2 rows of railings, recessed floor D rings, and something to tie to in the overhead storage over the gooseneck.
Spare tire storage near a door.
At least one side door. One on each side is awesome!
Roof vent fans. At least 2. Trailers can be ovens.
Interior lights. Loading in the dark is a safety issue.