I have carried a scooter using the ramp style motorcylce carrier from CW. I forget the brand name but it is very sturdily built and adjustable. It is ackward to load the scooter if the carrier is high off the ground. What I have done is to raise the front of my MH with the leveling jacks. This lowers the height of the carrier considerably and makes loading/unloading easy. It also helps to have a tiedown strap ready to stabilize your ride as soon as you roll it into place.
Since I now tow a dingy, I'm looking to sell my carrier if your in the So Cal area and your interested.
97 Aerbus XL3250, 06 Honda CH80
DIY Banks, track bar, acoustic insulation
Koni FSD front/Bilstein rear