I carry a decent supply of hand tools, 1/4, 3/8, 1/2 drive sockets and ratchets, wiring supplies and tools, pex plumbing kit, Dicor sealant, Eternabond tape, and misc specific rv related parts that might be hard to find on the road. I do carry a 12 ton bottle jack, cordless Milwaukee impact and socket, 3’ breaker bar and torque wrench when traveling. I don’t carry a spare but many have had wheel seals go out or if there were brake issues, I would have no problem pulling it apart to fix it. Done right, you never have to lift a heavy tire to remove or install. I like to be prepared and not be setting on the road waiting for help if I can help it. I made a built in tool box that fit in a small unusable compartment that most all tools fit in, spare parts go under the bed.