I called Carry-On trailer corp. at 1-706 356-5379 and they will make a custom no floor trailer for you. They can make it 5X8 or 5X10 and if you specify where you want the axel they can do that also. Tractor Supply Co. did not have any left to take a picture of. They only handle the 4 X 8 version. The manger said he sells them as fast as he can get them.
It is just an angle iron frame with angle iron cross pieces. Your floor can drop in to the frame. There are no sides to deal with. Just the frame with welded spring hangers, springs, axel, wheels/ tires, fenders welded to the frame, tong tube with hitch and a tail side marker lighting kit. It’s everything in a trailer frame to start a teardrop.
Chuck