Most standard factory ramps are too short with an angle too steep to load a low profile unit without hitting the ramp or the ground. The solution is to upgrade longer ramps that reduce the angle between the trailer and the car while loading. But even longer ramps don’t always solve the problem with specialty units such as a Corvette.
The solution lies in reducing the angle by lowering the back of the trailer. We’ve loaded very low profile vehicles by backing into a grade. If the back of your trailer has ever hit the ground pulling out of a truck stop, you understand the principal. When the grade of the pavement changes over a short distance, the drive wheels of the truck can rise above the trailer, which can cause the back of the trailer to scrape the pavement.
A better solution is to jack up the front of the trailer. If you just need a small amount of additional clearance drop the pedestals of the trailer and crank it up. Raising the front of the trailer will lower the back and reduce the overall ramp angle. This can usually be done without disconnecting the trailer from the drive unit. Under unusual conditions like trying to load a Corvette with factory ramps the trailer can be disconnected from the drive unit and raised high enough to even lower the back of the trailer to the ground. This procedure essentially turns a 3-car wedge into a 3-car rollback allowing almost any low profile car to be loaded without hitting a front end spoiler.
Yeah it takes a little extra time… but dropping the back of a trailer to avoid spoiler damage it far better, than a $500 damage claim or more.