Dan,
I like to call our RV camping style as the USET (U.S. Expedition Touring) style, since true expedition camping in the civilized U.S. is no longer needed or possible (unfortunately) ... so on-pavement or off-pavement road touring is actually just about all that can be done in rigs with all the comforts of home when you get there. (And yes .... I used to camp - but not in an RV - in the High Sierras and the High Uintas.) The USET style of camping kindof requires being ready for anything that can be thrown at you - given that it's in the U.S. where you're traveling - as opposed to Africa or Siberia.
The above is why I would probably not buy an Earthroamer even I had the spare cash. There's really no place where it's needed or can be fully appreciated in the U.S. or Canada, and we're not into driving or shipping or renting an RV anywhere else but those two countries.
The only thing "wrong" with our current rig is it's not 4WD and it's got one of those doggone forward facing cabover windows which - you guessed it - was broken by a rock thousands of miles from home and caused us a lot of grief and came close to truncating the remaining part of an otherwise spectacular trip. It's pretty hard to carry a spare forward facing cabover window along.