Abstract: A one-piece truck bed liner is disclosed having its side walls formed in longitudinally extending stepped panels with riser and tread portions thereby defining substantially continuous horizontally disposed side rails for resisting bending stresses, cargo impact and frictional forces. The liner bottom and front walls are in ribbed form, connected by a transverse bend portion free of ribs, in a manner to avoid cargo impact to the bend area. The ribs in the liner front wall and the liner bottom wall adjacent the bend portion are formed shallower than in the main portion of the bottom wall section. The liner bottom wall ribs define passages having larger open cross-sectional areas than the front wall ribs for optimum venting air flow and strength to resist cargo bending stresses. The liner has border portions structured to conform with the truck bed tail gate access opening to avoid the entrance of foreign matter between the liner and truck bed while providing a custom appearance.

Abstract: A one-piece truck bed liner is disclosed having its side walls formed in longitudinally extending stepped panels with riser and tread portions thereby defining substantially continuous horizontally disposed side rails for resisting bending stresses, cargo impact and frictional forces. The liner bottom and front walls are in ribbed form, connected by a transverse bend portion free of ribs, in a manner to avoid cargo impact to the bend area. The ribs in the liner front wall and the liner bottom wall adjacent the bend portion are formed shallower than in the main portion of the bottom wall section. The liner bottom wall ribs define passages having larger open cross-sectional areas than the front wall ribs for optimum venting air flow and strength to resist cargo bending stresses. The liner has border portions structured to conform with the truck bed tail gate access opening to avoid the entrance of foreign matter between the liner and truck bed while providing a custom appearance.