The rules regarding CDLs is changing all the time. As an example, if you drive a 45 footer in CA you need a license to do so. In 1992 or thereabouts when the CDL was listed in NY as a requirement for coaches over 26000 lbs with air brakes I know the NYSP near us were pulling out of staters over and the RVs remained parked until someone with at least a class B with air brake endorsement was available to drive them.

Then for whatever reason all of the requirements were relaxed.

I have recently seen elsewhere that more and more states are requiring appropriate non-commercial Class B licenses.

I think everybody driving a Prevost at the very least should get a non-commercial class B if for no other reason than to be legal no matter where you drive. It won't make you a better driver, but it will make a lawyer work harder to point a finger of blame at you if you are involved in a fender bender.