I found a piece of plate aluminum in my other shed the other day. after some measuring I came up with this. it only has one bend. if I had a longer press brake and a larger piece of aluminum I would have made it fold over the side rail. I used 1/4 20 rivet nuts to mount it. it works out well and realy adds a lot of protection. now I will re do my flaps to keep some of the mud out of there.