tire pressure and valve stem issues

Here is a quick check of the tires that truckers use. Rather than crawl under the rig to check the inside tire (assuming you do not have valve extenders) hit both on the tread with a hammer. They should both be at about the same pitch thump. If one is a dull thud instead of a thump indicating a low tire you will hear it. Also many truck stops sell a small club for this called a TIRE BUDDY. It is wooden with a metal weight at the end. When I was trucking and would pull into a rest area to use the john I would take a walk around the rig and thump all the tires(except the steering ). Then if there were any shady looking people hanging around I would keep the club with me while I used the john. The sight of the club will discourage any person with bad intentions.