How strict LE is with enforcement of the Class A license on the way to take the test varies from state to state. I've seen some postings that claimed California can come down pretty hard - but I don't have any personal experience with that state (Texas is much more relaxed on getting your rig to the testing site). California's requirements on which tow vehicle/towable combinations require which class of license are also different from many other states (other states often align with the Federal DOT guidelines for a tow vehicle-trailer combination with a combined GVWR over 26,000 lbs. AND a trailer over 10,000 lbs. GVWR).
What I can tell you is that there are numerous RV driving schools around the country. These are usually retired or former commercial tractor-trailer drivers who maintain their Class A CDL and give lessons in your rig. You might do a search and see if there are any in your area. They could probably also advise you on getting your rig home, etc.
Rob
