2wd or 4wd truck u made the trailer from? if its 4 just yank out the stock blocks and get some low profile tires and its would be fine, just like lowering a trucks ass end. just measure both rear fender lips to keep it fairly even, and i want to do it to mine just use a stepside. oh better yet!
take a shortbed 80s P/U, chop it in half like u did, do all the same back end mods (roll pan, shaved tails, led tails) as on my RC, then narrow the bed and add dually fenders (not the puney style, the big style). and just smooth out the inner bed sides to not have the wheel wells any more. think it sounds like a time useful idea?