One edit on one post "If you plug into 220 volts you will blow..."
True in part.. the 50 amp outlet at an RV park is a "240 volt" outlet but
It is a 120/240 volt system (It can deliver both 120 volts (twice) and 240 volts)
As I said your motor home will figure that out.
HOWEVER plugging into a 240 volt at a friend's garage or at home... NOT a good idea because that is a 240 only system not a dual voltage like the park
So long as you are plugging into an RV park, theory has it you are good.
In practice.. Some parks do make mistakes.. the Progressive Industries HW-50C (50 amp rig) or HW-30C (30 amp rig) properly installed is designed to protect you when that happens.