Most RV shippers are paying around 1.30 to 1.50 per loaded mile.
CDL only comes into play...from what I've read and the license branch has told me, when hauling commercially for profit...it doesn't pertain to RVs, but its based on your state of residence and you still have to make sure your insured as a lot of ins co won't cover you on a personal coverage situation if they find out you pulling even RVs for profit.
I'm looking at doing this myself...just finished the DOT physical. I'm going for the CDL only because a local trailer co dels cargo trailers all over and he requires a CDL before he will hire, otherwise no CDL required in IN for RVs.