I wanted a fairly large tub, big enough to stuff a 13" tire at full suspension squat. The main problem with doing this to a wagon is the back seat. I want to keep mine totally functional in the up and down position. This required some creativity and some trial and error. Finally on the 3rd cardboard design I got everything to work out. I started with a "chip board" pattern and flat 18ga sheet metal to come up with the sides.
Using the pullmax I raised the edge to a 90 degree angle
and using the slip roller bent the top.
