XFile, also get one of those fabric cat harnesses, if you don't have one already. Like this:
https://www.amazon.com/Weather-Voya...F8&qid=1492976013&sr=1-6&keywords=cat+harness
Get OldKitty used to it long before you'll need it. Just get her used to wearing it, first. Then let her drag a leash so she gets used to attachments. Then do a little guiding on the leash. Then do some walking on the leash. Get her used to the vehicle the same way: sit in the car with her loose; let her stay there by herself; sit with her and turn the engine on, let it idle for a while; drive around the block; go on longer trips.
Baby Steps all the way. Cats are creatures of habit. They can learn, but they need time to think about things for a while before they're comfortable with it. Treats are good.
Also, when traveling ALWAYS CARRY WATER. ALWAYS! Dump the mindset of "I'll do that when we stop tonight".
When ArtW said to take a piece of heavy plywood with you to set the jack on, he did mean PLYWOOD. Don't try to replace it with a piece of solid planking, which can split with weight and pressure on it. I would also buy a pair of wheel chocks to prevent the car from rolling when you raise the jack. They look like this:
https://www.amazon.com/MTC-20207-He...F8&qid=1492976432&sr=8-8&keywords=tire+chocks, but try to get some with at least one all-the-way-through hole in them, and then TIE them to your jack so you won't forget to use them. If you're raising the jack and the vehicle rolls, the jack can get jammed underneath, and you're stuck. We don't need to go into exactly how I know this..... :blush: Have a patient person show you how to change a tire: YOU do all the work, he/she gives directions. Make a written list of the steps you have to do, have it laminated, and keep it with your tools.
It would be better to keep a spare van key on a cord/chain around your neck than hidden under the van. Even stupid car thieves know where to look.