Both of my last two cats loved to be in the cars so long as they were in your lap or on the floor by your feet. We would never let them sleep in the window unless we were parked because the police would pull us over and give us a ticket because if there was an accident, they could go flying through the window or something. Other than that, I think cats are preferable for longer rides because they naturally sleep 16 hours a day while dogs need to be walked multiple times. My grandpa had a trucker friend who had one of those really fluffy white cats, I doubt if it was a pure bred but it might have been, who had her own bed seat belted into the passenger seat for her to sleep in. They've gone cross country delivering goods and she's great because she doesn't need that much exercise. They were really close after so many years, that he could let her out of the truck to walk around the truck, urinate, and stretch, while he got gas or got a drink. When he came back, he would whistle and she would come back and leap into the truck and they would be off.
