If they qualify that as a class A combination, I'm not clear that it really is, but if they ok it that's what matters. You also have to have all proper registration, inspection stickers and insurance for your rig
*and* you are not allowed to drive it yourself without a CDL driver in the passenger seat until you get your CDL, and you have to have your CDL learner's permit for that. Renting a truck that comes with all inspections, insurance, registrations and a CDL instructor familiar with the test route in your area is a much better deal.