Originally Posted by Dan O.
"The 'Safety Steer' is definitely a good bit of insurance. I also run the tire monitor system on all six MH tires and the four race trailer tires. I run 110 pounds in the coach tires and did pick up a nail in a steer tire one day. At 80 pounds the tire alarm went off (handling felt the same) and I saw 40 degrees more temperature in the low tire. Point is, some other warning signs are sometimes there before you experience an actual blowout."I suggest you change the warning psi level. Many TPMS come with a single warning after a loss of 20% from the cold inflation. We all know that when running, tire inflation can increase 10 to 20 % from the CIP (cold inflation pressure). I would suggest that if your CIP is 110 then the warning should be no lower than 100.
Some TPMS provide early warning and alert when the hot pressure has dropped faster than normal so you can gain seconds to minutes advance warning if the TPMS provides "rapid air loss" warning or some other warning based on the hot pressure.
Based on weight my small Class-C needs at least 65 to support the measured load. I use 75 as my CIP and my warning level is 65. My normal hot pressure is 80 to 85. If I pick up a nail I would get a warning if a tire looses more than 3 psi in a couple minutes so I might get a warning at 77 to 82 psi, which is well above the minimum needed by the tires for the actual load.
If a tire loses 20% of the air needed to carry the load it is officially "flat" for warranty purposes so there is a potential that the driving as Dan did with the tire down at 88 was damaging the tire structure which could shorten its life by months or years.
According to the U.S. Tire & Rim Association the warning signal from your TPMS should go off if inflation ever drops to below the level needed to support the actual load on any tire.