You don' mention what kind of motorhome you have, but we have a CruiserLift to carry a 2009 Harley Davidson Ultra Classic or a 2014 Harley Davidson Ultra Classic. We have used it for about three years and 40,000 miles with zero issues. Make sure you purchase some really good tie down straps, I personally used Harley Davidsons straps, and I also carry a spare or two.
What will be the hardest part of the whole deal is watching your bike bouncing around on the lift in the rear view camera all the while worrying that its going to fall off the back at 70mph. That, is the hardest part.