Dollies are fairly common.
As far as getting in a standard garage, maybe with a popup, but forget it with a hardside.
Think about it: A 6'+ person can stand upright in a hardside with some inches of headroom. Add a foot for the basement and roof. Then add in the height of the AC unit on top, about a foot. Then add in the height of the dolly, another foot...
You're still over 9' tall with the camper down on the dolly. No way it will go in a standard 7' high garage door, which typically only has about 6'6" of clearance due to the door not retracting completely.