The "don't leave" rules are written by over-zelous people that have no concept of an air-conditioned or heated RV, but instead are more impressed by the horrid media stories about pets and children getting baked in closed vehicles. Also, the park management may have had bad experience in the past with pets left in RVs. In our case, we are in a Class A fro the exact purpose of protecting our pets. in addition to the AC, we have thermostatically controlled fantastic fans which are battery powered in case power goes off while we are away. If power should go off, the fans will remove the overheated air from the top, and draw outside air in through windows and vents open for that purpose. Like the others said, I would move on. If the ambient temps are too high, I would be quite concerned about going out for any length of time anyway.