Portable Loading Dock Who Sells Portable Aluminum Gravity Conveyors?

Who sells portable aluminum gravity conveyors? - portable loading dock

Vi McDonalds or a Wendy's food their vans with a small carrier that could move the truck drivers, food to the back of the restaurant has to. So I need something for my shop, because it has a loading dock. I need something light and portable, you can do to remove. Thank you.