I had my oil changed at one of the drive thru places and they let 30 psi of air out of the rear of my pickup truck. I did not notice until I got home and getting ready for a road trip with my camper. I called the place and talked to the mgr. asking him why they did it his response was ALL trucks take 50 lbs. I asked him if he knew there was a plate on the door telling them that the backs take 80 lbs. He seemed befuddled like I was talking some foreign language. Why is it they always loose the chrome valve stem caps?