The safest way is to put the bike on a trailer - the one I use is a Kendon Dual Rail foldable trailer that only weighs about 300 lbs, but can carry 2000 lbs. Bike and trailer tip the scales just under 1200 lbs so it's not a real heavy load for any RV, and being a trailer it's able to be backed up if needed.
----------------------------------------------
Alan & Sandy Hepburn driving a 2007 Fleetwood Bounder 35E on a Workhorse chassis - Proud to be a Blue Star Family!
Good Sam Member #566004