Beacher, here is one example of a mid-size flatbed tow truck which also has a wheel-lift attachment. As you can see it has significant rear overhang which "may" be of similar length as that of a motorhome if designed with the load in mind.
I'm just saying that it may not be practical for other reasons, but engineering limitations isn't one of them. Not when the MH manufacturer can extend wheelbase, shorten rear overhang, and/or shift MH center of gravity forward by other means.
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