I think you're talking about a Load Handler. They're ok. I've never had one but have seen them in use. You need a slick bed, and you can have problems with them pulling out from under the load...the material in front of the wheel wells can cause the material to lock in place so some hand unloaded may be necessary. But for the price they're not a bad option. I often lay a heavy duty cordura nylon tarp in my truck bed for hedge clippings and light brush, then just pull it out.