What I do is just top of my tires before I leave on a trip or top them off at a Flying J when I get gas. Air is not going to leak out on your trip unless you have a bad tire. I do carry a 12 v compressor and a tire plug kit as well as spare tires in both the MH and the tow car in case of a flat. I have had to use the plug kit and 12 v compressor twice once for the MH and once on the tow car. These small compressors take a lot of time to pump the tires up but enough air pressure to drive to a gas station to top off the tires after the tires are plugged.