You may want to look a little further ahead and consider some of the lift units for entry that vcan be installed on a motorhome.
http://www.startrackslifts.com/Renegade-RV-handicap-seat-lift.html
https://www.mobile-lifts.com/motorhome-and-rv-lifts/
https://www.coachlift.com/rv-lift/
These are just a couple, others are out there. Just google RV entry lifts.
PPL Motorhomes even had a couple on their site last time I looked.
