Class B CDL, because Millennium requires it - When I took the driving and pre trip inspection test, I had to talk the guy into letting me take it in a bus, because he said " You don't need a CDL to drive an RV " He wanted me to take the test in a 26,000lb bread truck - I convinced him that if I could handle a 45', 52,000lb bus, I could handle a 26,000lb single axle bread truck - We discussed the fact that all the big rental trucks ( U-Haul, Ryder, etc) have a GVW rating of 25,999lbs so a CDL isn't required.