Quote Originally Posted by K & L
You could also line the carrier with pet house breaking pads. When/if they get soiled just change them out.
I was going to suggest this as well. When my husband made the drive from Indiana to California, this is what he did.
He also told he that he tried making periodic stops to let the kitties stretch and eat/drink. We have harnesses, so they could walk on the grass without escaping. I think they mostly used the litterboxes when he smuggled them into the hotel for the evening though.

Good luck on your drive!

**hugs**