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I might have summed up better by stating that it is almost impossible for a motorhome to equal a trailer for FE, that the purpose of a motorhome has to be that which a TV - TT [tow vehicle - travel trailer (of any description)] cannot do.
So, yes, a "shop" or other where a truck chassis / drivetrain is necessary. The addition of pumps, motors and other weight-penalty additions so that several vehicles, maybe up to a dozen, can use the facilities offered by a moho.
Screened porch / mud room: good description. Extend it to daytime animal pen (pets) and other peoples children.
freebeard, if you state the number of nights aboard [X] for the number of people [Y] without external inputs you are most of the way there as water + fuel (propane + battery capacity) can be calculated in advance. Then a reasonable distance under best conditions for drivetrain fuel theoretical maximum. (I'd use 500-miles).
Look at Class C motorhome capacities as a starter. The examples above of Rialta, Le Sharo, etc. There is a minimum which some types won't meet a realistic time (at least 3-nights, but a week would be better as the difference between two aboard and four aboard really starts to show up.) A moho for only two is getting extravagant (weight of vehicle[s] to provide shelter, water, etc.
Really, one is really no farther along than with a contractor van and portable toilet + water containers and propane exchange tanks . . in which case, why an expensive moho?
[4] adults, [5] nights and [500] miles seems on first glance enough to design around.
As RV travel is generally in the vicinity of 300-400 miles per day (after a week or so at each camping spot) one can see how these numbers work with each other. Five nights of full independence ought to also meet a reasonable beginning for RV use in the face of disaster, etc.
A trailer is expensive, but a moho is an order of magnitude yet again.
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