Originally Posted by
PatrickGSR94
Drilled a hole in each side of the trailer frame and matching holes in the plywood (just one each side), attached with hitch pins and cotter pins (just barely visible at the bottom edge of the pic). Then I hammered carriage bolts up from the bottom through 4 holes in the plywood with nuts on top to hold them in place, then fender washers and wing nuts inside the box.
Interesting. I don't have a ton of handyman experience, so I'm not entirely sure I understand the holes on each side of the trailer frame. You've got me thinking, though. I might try something similar.