Many of us use the TST 507 system. I have had it for 5 yrs. I have never had a blow out or even a low tire. But it is something of a comfort to be able to see the tire pressures any time I want while in the middle of a long drive. A TPMS will not prevent a true blowout. But it can alert you to the fact that a tire did blow that you may or may not have heard all the way back to the trailer. And it will also alert you to a tire that may have picked up a nail while you were driving and allow you time to find a safe place to pull off the road, or even get to a tire repair facility, before the tire goes so low as to destroy the tire. People say that they always check their tire pressure every time they stop. But tires don't just conveniently lose air when you stop for a pressure check. It is common to drive for several hours straight without stopping. And a tire with a nail or screw can lose a lot of air in a shorter time than that. Even "good" tires sometimes pick up a nail or screw or other sharp object.
