Yes I knew that trailer frames rely strictly on the structure above the frame. Same way a enclosed trailer works. The camper part seems fine when driving down the road, it’s just after loading the SxS going down the road I can see the rear going up and down going down the road.I guess what u didnt (or maybe did) understand is that the box on the original trailer was designed to give it the stiffness it needed.
My 28' open deck 14k goose has 10" I-beams running underneath supporting a deck thats a little lighter then your entire trailer. Maybe im being dramatic but that thing looks like a disaster waiting to happen. Everything on that trailer looks way too light to hold the weight and the wheels r too far foward.
It needs I-beams or several trusses welded in.