After having had a flat tire on my RV multiple times and was caught off guard by a low tire that nearly rolled over my towed jeep, I looked for a solution that he could provide . I didn't want to spend time and money installing internal monitors, which severely narrowed the scope. I went with the Hopkins system and after driving over 5,000 miles I can say they save me time and effort with accurate readings. . If I hear or feel anything strange, all I have to do is look at the monitor to see if there's a problem with the tires. They give me the certainty of being on the road carefree for long hours. This is a "must have" for anyone who spends long hours on the road. Between properly inflating for better gas mileage and avoiding costly repairs after a puncture, they've saved me a lot more money than they cost.