Here are some helpful hints:
1) Study Chapter 14 of the following:
https://www.txdps.state.tx.us/intern...orms/DL-7C.pdf (Commercial Rules section)
2) Call (in advance) to the location where you are planning on taking your written test. Tell them you are seeking "Non-Commercial Class-A and have an exempt Recreational Vehicle". If they ask how "big" it is, tell them over 26,000 lbs combined with the truck. They should indicate that you have to take the "commercial rules" test and only that test. If they indicate otherwise, refer them to
https://www.txdps.state.tx.us/intern...orms/CDL-2.pdf which says the only written test that is required is "Commercial Rules".
3) If the still insist on give you alternate information or other tests, have them call Zach Winsier at DPS (512-424-2000 extension 86813).
4) IF you pass they test, the should issue your a Class-A learners permit.