How to Load a Low Profile Car onto a Car Tow Dolly 

Leave in park, the back wheels only move.

That is backwards, you will see before you drop the wheels off the curb the nose will bury into the ramp. If you put the ramps ON TOP of the curb , since the wheels are still on the High side the low profile part of the bumper will smack the dolly ramps even sooner. so getting the wheels to rise in a low and then next step up is the only way Or find a way to Back the car up on both sides without getting in the way of the dolly being slide under the car by hand ( These kinds of two wheel dollys do not Back up ) and then letting it down. I can't imagine the process of that though without a actual Car lift. I only wrote to you when I saw your comment because I tried Everything short of taking the bumper off ( Which I have done before ) but now, I feel like a real bone head cause I could have just made some ramps like this video shows, LOL I have Big ole 2x6's all over the place here. I'm just going to make some and when I have teh dolly , going to get a car, I will toss them in the back of the Yukon.

I know the struggle brother