You can keep your camping vehicle or RV cool fairly easily. For starters, you can cover your vehicle or RV with tarps, awnings and other types of materials to keep the sun off while you're away. This will help to not only heat the interior but also prevent some of that radiant heat from being absorbed into things like seats in vehicles which absorb more energy than cooler surfaces. Another thing to consider is having shades drawn on windows and doors for when it's still light outside so as not to let sunlight inside during those hours too--this includes tents! And if all else fails, make sure there are ample fans around circulating air (either battery operated or otherwise).