The rear overhang doesn't look much different from a travel trailer or 5th wheel. If you think about them the axle's are placed such that the entire unit is balanced on the axle's with just enough bias to give them an acceptable amount of hitch weight (5th wheels a bit more hitch weight).
The balancing act with a motorhome is a bit easier because they can put the tanks between the wheels and (in the gas engine ones) you have this big chunk of metal way up front.
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