Well, update - I adopted the 2 kitties, and I am so happy with how things have turned out. They've been with us a few short weeks but they're already troopers. They went from an apartment living with an older, quiet woman to a single woman in a townhouse their foster home. Now they're in a house with 2 larger dogs, 2 boys - it's not quiet, that's for sure.
They're not afraid of the dogs (everyone is still getting used to one another, but the cats are the bosses ultimately) and will follow my husband and I like little dogs. When it's time to go to bed at night they hop up and start purring and chirping and kneading their paws, ultimately settling down in between us or under the covers. I just can't believe how sweet they are.
I'm really eyeing them for future Airstream trips. Too bad it's in storage now, would be nice to get them accustomed to the trailer now, but I'm sure things will be fine. Our first trip next season is going to be to Florida, a 1500+ mile adventure. That won't be the time to turn them into camping cats. I'll wait until we have a trip that's a wee bit closer before we do that.
I'm planning on having them ride in the truck with us - 'cause not every car trip has to end up at the vet's, right?
Also planning on putting the litter box in the shower, and jimmying the door so that it can't accidentally close all the way.
Will post pictures next spring.