The reason for this comes down to safety and the additional pressures that would be exerted on the components when your Blue Ox Ascent # BX4370 tow bar is not level. The additional force that is put on these components ultimately makes it more likely that there is a catastrophic malfunction while towing your vehicle. I'll also add that while you may not see much binding currently since you're on a flat surface, it's more likely to happen over time with maneuvering around corners and up... view full answer...