For the past few years I have been using a 1.8 yard V box salt spreader in the back of our dump truck. These type of sanders take a beating and are a continuous battle with maintence. Some of the problems are imposed by the people who load it with material ( salt ) .. The local yards use a 3 yard loader and inevitability make a mess. I have already installed a rear extension that helps keep the salt from landing on the motor cover.now im thinking about installing side flaps that slope down from the top of the sanders to the sided of the dump body. Has anyone done this ? What material did you use ?