I'm sure that in the 110 or so post you were told about acclimating your cats to RV travel but I'm not about to read through all of that this morning. I've only got a few moments as I have to take the Winnie in for repairs to the Onan.
A safe place to hide, something personal from home, a dark place for daytime and of course food, water and a box. Spike rode with us for ten weeks on our Alaska Dream Trip and we took months to get him use to living so closely to us. With more than one it may be a little harder but it's just getting them use to the travel part.
Spike was deaf so barking dogs were never a problem, in fact I can't remember barking ever being a big factor since we started camping back in the early 60's. There have been some I'm sure but a place to hide during the day goes a long way.
Spike slept on a quilt my wife and daughters made for me and I used the same towel for him to rest on when I had to hydrate him(cronic renal failure), we took them with us and he knew while the walls and furniture were different, it was still his house.
Good luck and I you have specific questions, PM me.
David