Tuesday, November 28, 2023


What’s a good tire pressure monitor system for a Class A?

RV Tire Safety

with RV tire expert Roger Marble

What’s a good Tire Pressure Monitor System for a Class A? I had this question asked on an RV forum I monitor. Thought I would share my answer:

While I don’t have a Class A, other than the length, I’m not sure if any one system is significantly better than another – as long as the system you buy can handle the total number of tires on your coach plus toad AND is rated for your tire pressure. Warranty length and service may be the only meaningful difference between some units.

I have done what I think is the only direct real-life comparison of internal vs. external system back in 2018 and published the results.

But some general observations and comments:

IMO, user-replaceable batteries are a plus. You can confirm the battery part number (P/N) before purchase and check at a grocery store or at Home Depot or Lowe’s for both price and availability, but most are under $2 each and last 1 to 2 years depending on use. I have found that after 8 to 18 months use, low battery power may contribute to the dropped signal. My solution is to mark the install month-year-date with a Sharpie.

I do like a system with a long (lifetime?) warranty and one that actually has the dealer/distributor attend RV conventions, as that means they have people that are not just selling “widgets” on Amazon and probably have a telephone, email and website.

RE: Repeaters. I have listened to the “sales-pitch” from a number of different vendors at an FMCA Convention and most will ask about the type and length of coach and offer a suggestion to get a repeater, or not. But I also note that some will offer to send a repeater for just the cost of the repeater if you discover you need one later. Others just include a repeater with all sales. Just ask and see what they say or offer.

Alarms going off. I have a blog post on how I set my TPMS and haven’t had any false alarms with the TireTraker system I purchased in 2009. (I did upgrade to the TT500 in 2018 after I killed the original TT400 monitor by connecting the wrong charger to it. My error, not TT.)

I have found I do not need a power cord to the monitor on the dash as a single overnight charge is good for weeks of daytime use.

I do shut off the monitor each evening. In the morning I turn it on again and by the time I am done with my coffee all 6 sensors have sent in the baseline pressure so I get a fresh “cold” pressure reading just to keep an eye on things.

Do not be confused with the time to establish a signal. As far as I know, sensors only send a signal once every 8 to 15 minutes to conserve battery life. They also will send a Low-Pressure warning within 2 to 4 seconds. Read the literature or ask the dealer to learn what your system timing is.

Maintenance: I do run a “test” every year to confirm the sensors are still reporting air loss in the first few seconds. The post also covers spare parts I keep on hand.


Read more from Roger Marble on his blog at RVtiresafety.net.



Roger Marble
Roger Marblehttp://www.RVTireSafety.net
Retired Tire Design and Forensic Engineer w/50+ years of experience. Currently has Class-C RV. Previous Truck Camper, Winny Brave, Class-C & 23'TT. Also towed race car w/ 23' open trailer and in 26' Closed trailer. While racing he set lap records at 6 different tracks racing from Lime Rock CT to Riverside CA and Daytona to Mosport Canada. Gives RV and Genealogy Seminars for FMCA across the USA. Taught vehicle handling to local Police Depts



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tom, (@guest_50138)
4 years ago

My ‘tpms’ has NEVER sounded an alarm, although, one tire has dropped to 30 psi without alarming, on several occasions. Removing the sender from that tire has stopped the very slow loss of proper pressure. A real POS.

Roger Marble (@guest_50502)
4 years ago
Reply to  tom,

Sorry you had problems. Here is a post from my blog on how to “Test” your TPM system. I strongly recommend EVERYONE do this testing at least once a year. http://www.rvtiresafety.net/search/label/TPMS%20testing

Dr4Film (@guest_50063)
4 years ago

I prefer to use the Tire SafeGuard TPMS and like it so much that i have one in the coach setup with 6 tires and 4 Toad tires when towing the car. One just for the car when using the car and one for my motorcycle.

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