Those topics keep on coming every few months and the truth is that there is no short answer.
When RV are generally exempt from CDL, some states require non-commercial ClassB or whatever, some states require special licence for >40' motorhome, some have endorsement for air brakes, some for dual trailers.
To top it, all those laws change every few years and even if you did something last year, doesn't mean it has to apply today.
Bottom line >>> for legal questions call your state DMV.
In CA DMV usually has 1 hr hold, but they make convenient call-back so you don't have to spend an hr with phone to your ear.
