We're building up slowly to long distance travel with kitty. We just did a 2 night trip and took him along, and he actually seemed to enjoy it.
After the first half hour in the car, my son opened the carrier door (they share the back seat) but the cat seemed happy to stay where he was, very little meowing.
We made a snack stop along the way at McD's: 2 sodas, 1 large fries, 2 apple dippers, 1 completely plain burger patty. Kitty had 3 bites, and was happy. He prefers McD's over In-and-Out by a mile.
At the beach house we borrowed, kitty
loved the wildlife viewing. Squirrels and bluejays feed right on the deck during the day, and raccoons come at night. He was a little peeved when we shared his kibble with the raccoons.
No litter problems, no howling, no scratching. Bodes well for Kitty's next trip.