Can anyone tell me where I can locate a supplier for an arched tarp / cover setup for a stake bed? I'm referring to the type that has several arched rails in the bed with a tarp streched over it. I've seen them in several styles going down the highway, but don't know where to find one. I'd like to get one for the winter to keep the snow off of my supplies when the sidewalk crew is out. Kind of like a box truck with out having to buy an extra truck!