Hello, I am having flashbacks reading about the flexible valve stems losing air and blown dual tires. I would encourage anyone to remove them. I have been totally happy with the use of nitrogen in my class tires for almost two years now. Then use a dual head tire gauge and the caps that allow you to check the pressure. I have had my tires checked 4 - 5 times each year and the nitrogen has only varied 1 - 2 pounds during each check. 3 or more tires need nothing. Regardless of the stems, caps or monitors, try the nitrogen fill. It is GREAT. Also, I had friends with an American Tradition blow a tire 8 miles short of Key West. Their monitoring system alarm was turned off. The bought the coach used and it was not something anyone thought to check. Take care.