I used to make my cat ride in the truck, uncaged. She was extremely vocal, for hours on end, although she didn't appear to be stressed. During one lunch break I turned her loose in the 5er to eat, drink, use the litter box. When I was ready to roll again, she hid in the RV where I couldn't get to her. OK, that's how she finished the trip and where she's ridden ever since. At the end of a long drive, she strolls out from wherever she's been laying down like it's an ordinary day. I do take special precautions when the slides come in or out to make sure she doesn't get caught.