Highway Product 36 X 24 X 24 Underbody Box Smooth Aluminum Right Hand Side Single Barn Door Model 0312-003Highway Products Highway Product 36 X 24 X 24 Underbody Box Smooth Aluminum Right Hand Side Single Barn Door Model 0312 003 Underbody tool boxes are often overlooked when ordering trucks and trailers. They all have similar looks on the outside and seem very simple. Take another look before you order. Look at the metal thickness: if it's not an 1 8 inch thick, it just won't last! Road conditions are too tough. Look at the hinge. Does it look oversized?