Doors that will never sag and don't need bunji cords to keep them closed.

The doors of our double-door, side open underbody tool boxes close into the frame of the box. The frame style underbody tool box keep the doors protected from road debris and even bottoming or in a high center situation.

The doors of our double-door, side open underbody tool boxes close into the frame of the box. The frame style underbody tool box keep the doors protected from road debris and even bottoming or in a high center situation.

We have seen many times where the trailer has been high-centered on railroad tracks, dragging the underbody tool boxes, and actually lifting the trailer off the ground while dragging. Afterwards, only minimal damage to the bottom of the Highway Products underbody tool boxes. The doors still worked fine. We've seen where the trailer was dropped, fully loaded, without the landing gear down. The boxes took the full force. Minimal damage to the underbody tool boxes and the doors still worked fine.

Sturdy mounting systems

To properly support underbody tool boxes and their contents, we always recommend mounting them in a cradle type of mounting system that does not allow side-shifting. We call side-shifting the travel the tool box moves when stopping and starting. This undesirable travel tries to tweak the tool box which works hardest on the corners. In fact, our experience shows most of the problems with underbody tool boxes are due to an inadequate mounting system.

Because of cost and circumstances it is often more desirable to mount from the sides of the tool box. So we offer two mounting systems: Please visit our mounting bracket page.

Want something special? Ask for mirror finish Stainless Steel doors.