bedliner

plural bedliners

1. A plastic shell that lines the bed of a vehicle.

   Pickup truck bedliners are durable high-density molded polyethylene inserts that slip over the exposed cargo bed.

   1993 July, Field & Stream, page 68

   1 more example

   Even when you order your late - model pickup with a drop-in plastic bedliner from the factory, you might experience rust buildup between the plastic bedliner and the sheet metal of the truck bed after a few years.

   2007, Rick Shandley, 101 Performance Projects for Your Pickup and SUV, page 221