I would take their crates and just leave them for short periods of time at first. Also turn on the air and leave on a radio or the TV. And then see how they do. If they do okay and you plan on leaving them for a little longer time, I would put sign in a window that says "Pets Inside" or something similar in the event something does happen while you are gone and rescuers will know. Some campgrounds don't like it if you leave dogs alone in the RVs due to the possibility of barking and disturbing your neighbors. If they travel well in the truck and are under control while walking on a leash, I would take them along.