Abstract: An adjustable hold height lockable horizontal the two-piece member frame assembly method to attach and to lift a truck bed cover truck bed cover has a two-piece frame structure including front and rear frame members and front and rear cover panels secured thereon, the frame members hinged connected to move between a flat horizontal closed position covering the truck bed and an adjustable open position wherein the front frame and front panel is disposed adjacent to the truck cab and the rear frame and rear panel is disposed horizontally at selected hold heights above the bed, or extending angularly upward from the front frame and front panel. The cover can be adjusted and locked as option at selected hold positions between the closed and open positions.