temp control in the toy hauler garage for kids

Yes, both ends of the extreme. If I had the option of a third AC in the garage when we bought our Cyclone, I definitely would have went for it. In the winter, if power is available, we'll use a small portable heater. No way to avoid the heat other than maybe a fan. We don't boondock in the extreme heat of the summer but during winter, we just bring extra blankets and bundle up.