Ohio winters demand AWD cars; I'll never be without one now... due to the roads (in winter) where we live. But AWD does take the fun out of those parking lot donuts.
. But RVs? Different animal... unless you're primarily camping off-road.
But how many 4wd RVs are ever going off road? There's many thousands of Jeeps that never see a rutted dirt road, let alone an RV. Maybe a great advertising scheme... but in reality??