Although I could find some online articles about traveling with cats, their advice was too general to really help me. What I needed was specific information. I wanted advice on which type of carrier worked best for the ride. I would also need to transport the cats to a pet-friendly hotel room on the overnight stays.
It took a lot of searching through various advice pages, and reading Amazon reviews of cat products, to finally decide what I would try. Some items I bought were returned, and some worked out very well.
I'll share my first hand experience here for those of you planning a similar excursion.
All in all, the trip went better than expected, and the cats settled down and accepted their circumstances after the first few hours. By the second day, they were quiet the whole day.