Hi Ken. I know next to nothing regarding other states. California does not require a air brake certification as far as I have been able to learn. The Class B license in California is what is necessary when operating a Coach 40 feet and larger, as well as over 22,000 lbs. There is no brake test associated with this license although I have heard some examiners may ask questions regardless. Each state have their own license requirements but I understand they honor other states Laws for out of state drivers. Some states have little or no requirements for driving any RV.