Renting a Class C and using the generator/ ac for pets

Ponderosa wrote:
Rvs don't heat up like cars.

This. If the AC quits the coach will not heat up immediately like a car.

As far as the paranoia that has been expressed, the odds of those problems from a well maintained generator are very minimal. Use common sense and check on your pets every hour or two. If you are that concerned, don't travel with your pets, because all sorts of bad things can happen while traveling.