an idea just struck me for helping you travel with your cats.
we own a power adapter that converts cig lighter into plugs. get one,and get the kitty pheromone plugins. start it up before you put your guys in the car and run it for a while while on the road. cats respond SO strongly to the safe versus bad smell, and i think that would chill out even the most difficult guys.
You could also just prime the car with the kitty pheremone spritz. Why didn’t I think of that when I was on the road with Potter? Who knows. We went to Glenn’s the other night and I think something about the smell of his kitty with the spots (who is part wildcat) made Potter go ballistic. I sprayed the house down, and he chilled right out.
(Squeeee! I love my potter!)