Abstract: A truck is disclosed including a stock cab, a stock truck bed and a stock truck frame with these components mismatched to provide a space between the cab and the bed for a enclosed storage assembly extending as a box laterally across the truck and enclosed to the frame. The box includes doors to either side and neither the box nor the doors extend above the top of the sidewalls of the truck bed. The box may include a pivotally mounted top. A mounting assembly enclosely attaches the box to each longitudinal beam of the truck frame. The assembly includes a tab to mount to a mounting point on the truck frame. A J-bolt is associated with a bracket on the assembly and extends to a hole in the truck frame to engage the hole in tension. A locating tab is on the other side of the assembly from the J-bolt to cooperate with the J-bolt to laterally locate the mounting assembly on the frame.