Once you can back up while towing it's hard to go back to not being able... reason for building a wheel lift for the Prius. Since the Prius runs it was easier to use ramps to put it into the lift instead of having it raise/lower hydraulically. I already had three receivers so making something that is cantilevered off the back was fairly easy. There are two small wheel to hold it up when going through dips and it does fold up against the back of the MH when needed for a tight site.
Dumping let's all the air out of the two airbags on the tag axle. Lifting does that plus there a two air chambers at inflate and lift the tag off the ground. Even though mine lifts, the 1500 lbs the tag axle and tire weight is not enough to cause any appreciable tire wear if it does not lift. I only lift if I'm going to make several sharp turns.
