The Mule Back Rack provides vertical and large horizontal mounting plate surfaces for versatility in adjustability of mounting boxes, bikes, skis and/or many of your other favorite accessories. Perfect for that solid and exceedingly stable, yet simple to use Storage Box carrier system. You can mount the bikes lower for fast bike loading and unloading or move it up to avoid items mounted to the drivers side rear door. The X series of racks from JERK Engineered Products are all designed by engineers. We have applied engineering design to the geometry and strength calculations, and with an innovative design (patent pending) have created a system that does not piggy-back off of the hinges of the van, therefore there is no need to force the use of only 180-degree hinges to mount your rear systems to your van any longer.