Shooting straight from no experience to full-timing

My pets will be two cats, and a 16 pound Miniature American Eskimo.

What's an extended period of time according to RV parks? We will be gone likely 8-10 hours a day.

You mention extreme conditions. I know this is going to sound super naive, but is there no way to cool an RV? (Not worried so much about heating it, my pets like cool weather, and we don't intend on going anywhere too cold after this assignment). We are going to try to follow the mild weather, but I don't want to put my animals in danger.