I check/fill before every trip (It's the last thing I do before pulling out of the drive). Whenever I stop, I feel the hubs. If they're hot, I check the pressure. Low pressure causes the hubs to heat up. After I reach my campsite, I check/fill before leaving the campground. If I don't have a way to air up the camper, I'd stop at the 1st gas station I can find. Since I have a 10llb. Co2 tank I carry with me, I ALWAYS have air. My Co2 tank is a leftover from my jeep. With my 1st popup, it had 10" tires, and during the day, I never drove above 70 during the day (tires heated up too quick). My cousin made the mistake of ignoring that, and blew both tires in less than 250 miles.