Which company should repaint our class A RV?

Is there a reason that people seem to be only looking at special "RV paint shops" instead of auto body shops? The guy I use for car body work and painting has a large shop that I think would fit a RV, and I would be confident in his ability to do the work (he has had vehicles he worked on featured in major car magazines).

I'll try to remember to ask him (just out of curiosity). Seems mostly it would be a case of if a shop can fit the RV inside. (I probably just answered my own question...)