The Highway Products Roller Coaster Slide-out Cargo Tray for pickup trucks has a capacity of 4,000 lbs and is designed to slide cargo out of the truck bed fast and easy. According to the company, the product is 100 percent aluminum. The Roller Coaster glides on sealed roller bearings on galvanized steel Tee-Bone track system and safely locks into position with the dual Stab Lock locking mechanism, which enables users to lock the tray in place in 10″ increments. The Roller Coaster standard and custom slides are designed to fit all brand and bed size trucks, vans and service bodies.