My school of thought on this is, make sure you have an extra tank for your grill, and once the flame goes out, change it! not really a problem on the camper, since it already has two tanks, but I use the same thought process there. If I go to bed with the heat on, and wake up cold, it's time to switch to the other tank. I also use a small electric ceramic heater when we camp in cooler weather, so it's not that big of an issue.
2013 XLR 27HFS Toy Hauler
2014 Silverado 2500HD Z71 Crew Cab
99 Club Car Golf Cart