Ignoring the OP's 30 ft length requirement, I'd buy a small as possible motorhome (hopefully way less than 30 ft long) with:
No slides.
A total coach height of no more than around 11'6".
Two queen size sleeping beds.
All Wheel drive.
A 1000 mile or greater range before refueling.
A fresh water supply of at least 60 gallons.
A grey water tank of at least 40 gallons.
A black water tank of at least 40 gallons.
Plumbing and tank systems that didn't care about cold weather.
A coach heating system adequate for any North American freezing temperatures.
A coach air conditioning sytem adequate for any North American scorching temperatures.
A single-door 3-way refrigerator of around 6-7 CF that was properly installed such that it didn't care about any North American scorching temperatures.
A built-in generator that could power everything and was installed properly such that you could hardly hear it running inside or outside and that used the same fuel as the main engine.
A dry shower and toilet area.
A coach ceiling height of at least 6'6".
A distributed ducts heating system.
A distributed ducts air conditioning system.
Several outside storage cabinets, including one for sewer hoses.
An automatic outside step for the coach.
A manually operated main awning.
Outside retractable awnings above all windows.
Double pane windows that would never degrade.
At least two coach chairs of the zero gravity lounge style.
Powered by gas rather than diesel (if for exclusive use in North America).
At least 600 amp hours of AGM or lithium batteries capacity.
At least 600 watts of permanently installed roof solar panels.
Around 160 watts of portable solar panels that could be used up to at least 50 feet from the RV.
IMHO, the above list is not "impossible". Some currently available North American built motorhomes include - or could be optioned to include - most of the capabilties shown above. But so far only one or two full-on expedition style motorhomes built in North America are capable of MAYBE meeting everything on the list ... with the possible exceptions of the very difficult small motorhome requirements of "two queen beds", "at least two coach anti-gravity lounge chairs", and "powerd by gas rather than diesel".
The "gas rather than diesel" fuel requirement is just one of my personal hangups.
๐
2005 E450 Itasca 24V Class C