We have a Prius which has a very low ground clearance. The car could not climb the tow dolly ramps when they were wet nor would the front air damn clear the ramps. To get it onto our Master Tow dolly and clear the front air damn I had to build an additional set of ramps. I used 2x8 lumber 36Ē long with riser blocks on the front to give it the lift to mate with the tow dolly ramps. I cut notches in the wood to hold the ramps in alignment and keep the wooden ramps from slipping out while driving up and down them. I stapled and glued 6Ēx36Ē 80 grit belt sand paper cut into one long strip onto the wooden ramps for extra traction when wet.
The extra ramps serve two purposes. One, there is a smaller edge the car has to climb to get on the ramp and second it lessens the angle up to the deck so the air damn doesnít scrape or tear itself up going up and down a steeper angle.
To use the ramps I position the wooden ramps at the ends of the tow dolly ramps. Then I pull the hinge pin that lets the deck of the tow dolly swivel down and the metal edges of the tow dolly ramps drop down into the slots which holds everything in place. After the car is fully on the dolly the weight of the car will swivel the deck back into position to put the pin back into place.
Always take your car off the tow dolly BEFORE you level the MH or the angle on the tow dolly may be to steep and you will tear up the air damn. Ask me how I know.
I painted the wooden ramps red for two reasons. First, they are easier to see so I donít forget them and drive off. Second, red was the closest paint I had on hand.
This is my solution the same problem you are having, hope this helps.