Dont worry, I pet him so much before I had to go and after I got back. He's a very very good boy... Even when he throws up on my bed for no reason while surrounded by perfectly good hardwood floors.
That's such a valid fear! I didn't let her walk outside. I'd put her in a pet backpack for hikes or her carrier for tent teardown and such. There was a couple times when she tried to catch things burrowing under the tent, but I keep her nails nice and short so there was no damage to the tent.
She was so much more chill about it than I expected. I had gotten some of those calming treats with melatonin, but never ended up needing them.
That black and green thing in the background is a portable litter box with a pop-up enclosure. I had her start using it about 3 weeks before the trip, just to minimize the amount of new things for her which I think also helped keep her calm