Thank you for sharing your experiences. How was toilet and food for cats? Did they cry all the time?
In any case, them being on the seats (in carrier) rather than under them, helped a ton. The cats aren't as freaked out.
[1] https://sturdiproducts.com/products/folding-water-tight-boxe...
[2] https://sturdiproducts.com/products/folding-water-tight-boxe...
Glad I could help with the info. Cheers.