The problem with a class A is that shops don't want to work on them. If you get stranded out in the middle of nowhere USA, your towing fee could be extremely expensive and your down time tragic. The Ford E350/E450 and the Chevy 3500/4500 cut-away chassis are most apt to be taken care by shops because the chassis is very common and they can follow their shop software with no timely surprises.
I recall reading some years ago, one class A gasser required the removal of the entire face of the motorhome (windshield and all) to replace certain components. Think about that one.