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Jamie, these types of lifts don't use the hitch. That would be too much weight.
Like on wreckers, the lift attaches to truck chassis (in this case motorhome's chassis) and can be designed to lift any weight you want. See picture below of massive system for 18-wheeler.
Obviously the motorhome carries a large part of toad's weight, but it's less than if it had a garage where it carries it all. And it doesn't waste the garage space, so in that sense it's more efficient. No doubt the motorhome would have to be designed for this type of application from onset. It would need extra cargo carrying capacity and less rear overhang to work right.
The lift retracts under RV so it doesn't use space. And it should be able to back up (I presume) since car is like a trailer.
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