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Old 02-21-2017, 11:30 AM   #15
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Trailer TPMS

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Originally Posted by Mollysdad View Post
I'm concerned that any TPMS that replaces the valve cap must keep the Schrader valve pushed down. So the only thing keeping air in the tires is the device/valve cap.

Would the internal systems be more reliable?
I'm thinking of adding a system. My car currently has the ones that are inside the wheel, but attach to the valve stem.

Left in place, the sensors on my tires (Michelin LTX) have not shown any difference in pressure, whether with my TST sensors in place (on the road) or removed (in storage), over the last 18 months or so.
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Old 02-21-2017, 11:45 AM   #16
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Originally Posted by Llando88 View Post
Left in place, the sensors on my tires (Michelin LTX) have not shown any difference in pressure, whether with my TST sensors in place (on the road) or removed (in storage), over the last 18 months or so.


So far I'm not impressed with my goodyears holding pressure even before the sensors. Every trip I have to add 5-10psi to get them back to 65.

Common gripe about the goodyears I suppose.
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Old 02-21-2017, 02:57 PM   #17
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Originally Posted by joshjack View Post
So far I'm not impressed with my goodyears holding pressure even before the sensors. Every trip I have to add 5-10psi to get them back to 65.

Common gripe about the goodyears I suppose.

That mirrors my experience with GYMs insofar as persistent tire pressure loss over time.

I put the Michelins on and have not looked back. Obviously YMMV, and some folks have great luck with GYMs.

My change was precipitated by picking up a nonrepairable puncture in my GYMs within a short time (not the fault of the GYMs). However since I was going to have to buy a new tire anyway, I decided to just bite the bullet and buy five (Michelins).
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Old 02-21-2017, 04:16 PM   #18
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So first trip with the TST system and I'm pretty happy. The sensors worked great. The battery in the display unit is no joke. I ran a hardwired connection from my center roof console so it could have power, but the unit didn't need it. It was 3 hours driving each way and the unit still showed 100% charge at the end of the trip. The backlighting was a little bright, but better to have it too bright than not lit up at all.

2 annoyances - every-time you power the unit on after it's been idle for a while it has to relink to each sensor. Every-time it finds a sensor it starts squalling at you. So starting out on a trip it's going to squeal 4 times in a row. #2 - it defaults to tire temps in degrees C. I changed it to F and it forgot the next time I powered it up. I'm not sure that is correct operation so I'll keep playing with it, but that's what happened on this first trip.

I have TST 507 sensors on my trailer. My system works somewhat differently from what you describe. When I power on the system in the morning, it does take several minutes for all the sensors to check in, but I do not get the alarms. My system remembers to keep showing temp in degrees F.

My system dates from 2013. I have the non-flow-thru external sensors. BTW, I have changed batteries once. I found it to be a pain, because the O rings are hard to stretch out and install.
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Old 02-21-2017, 05:02 PM   #19
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Originally Posted by joshjack View Post
So first trip with the TST system and I'm pretty happy. The sensors worked great. The battery in the display unit is no joke. I ran a hardwired connection from my center roof console so it could have power, but the unit didn't need it. It was 3 hours driving each way and the unit still showed 100% charge at the end of the trip. The backlighting was a little bright, but better to have it too bright than not lit up at all.

2 annoyances - every-time you power the unit on after it's been idle for a while it has to relink to each sensor. Every-time it finds a sensor it starts squalling at you. So starting out on a trip it's going to squeal 4 times in a row. #2 - it defaults to tire temps in degrees C. I changed it to F and it forgot the next time I powered it up. I'm not sure that is correct operation so I'll keep playing with it, but that's what happened on this first trip.


Good deal. Mine syncs up within 10 minutes or so on all 4. It also defaults to F each time. And I don't recall any alerts from the main unit. It just gives one long beep at power up, then starts rotating through the four trailer tires.

By the time I connect the trailer, the TPMS is ready to go.
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Old 02-21-2017, 07:41 PM   #20
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Originally Posted by joshjack View Post
So far I'm not impressed with my goodyears holding pressure even before the sensors. Every trip I have to add 5-10psi to get them back to 65.

Common gripe about the goodyears I suppose.
IMO its unlikely the tires are simply all leaking. You didn't say how quickly the air pressure dropped. 5 psi a day / week / month?

Do you have bolt in metal valve stems? Have you checked for leaks at valve or tire wheel junction with a simple spray of soapy water?
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Old 02-22-2017, 06:48 AM   #21
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IMO its unlikely the tires are simply all leaking. You didn't say how quickly the air pressure dropped. 5 psi a day / week / month?

Do you have bolt in metal valve stems? Have you checked for leaks at valve or tire wheel junction with a simple spray of soapy water?
Man - great feedback on this thread so far! Sounds like I've got some settings to change on the unit to lock the temperature in F and disable the startup alarms. Back to the manuals!!!

Tireman9 - I haven't been on enough trips yet to pinpoint one tire, but the rear tires do seem to need more air than the fronts. On this last trip when I arrived Friday night they were all showing correct PSI. The driver's side rear did have more weight on it after parking on leveling blocks; and when it was time to leave I started the trip with it at 58PSI cold on Monday. That's a drop of almost 10 (started at ~67) from my Thursday afternoon trailer prep.

I'm generally having to add 5-10 PSI to all the tires at the start of a trip. This time the trailer sat on concrete from Thanksgiving till last weekend without moving - call it 10 weeks.
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Old 02-22-2017, 09:04 AM   #22
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I chose the EEZTire TPMS cause of the larger display. It has the external sensors. I don't have the metal valve stems, just rubber coated brass. Over 9000 miles and no leaks. Sensors don't stick out past tire sidewall.
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Old 02-22-2017, 10:09 AM   #23
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I chose the EEZTire TPMS cause of the larger display. It has the external sensors. I don't have the metal valve stems, just rubber coated brass. Over 9000 miles and no leaks. Sensors don't stick out past tire sidewall.
Can the monitor be programed to show 4 tires, or does it always show a semi with 22 tires?

I used to favor the units with internal sensors (like my car), then I realized they must be installed at a tire place, and if you rotate tires the system will read wrong.
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Old 02-26-2017, 08:00 AM   #24
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Can the monitor be programed to show 4 tires, or does it always show a semi with 22 tires?

I used to favor the units with internal sensors (like my car), then I realized they must be installed at a tire place, and if you rotate tires the system will read wrong.


The unit can be programmed to show the # of tires being monitored, however, the display shows a semi outline. I don't find this to be to troublesome.
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Old 02-26-2017, 08:09 AM   #25
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the display shows a semi outline. I don't find this to be to troublesome.
Drat! I posed this question (about the semi outline) to Amazon, and the manufacturer said it could be changed. But I read the manual and the only change I saw was you could override the trailer if it wasn't connected. That was not the default, so you had to do button presses every time it powers up.
Obviously this system was not designed for the RV industry, which may not bother anyone...except me.
Too bad they don't have the semi on an overlay that can be replaced.
It's still the best unit out there for now.
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Old 03-01-2017, 10:24 AM   #26
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We have the TST tpms on our trailer. I just posted in this forum yesterday about our tire changeover. Some of it includes pictures of my tpms install. I used the internal sensors versus the external sensors, just my preference. We like our system and enjoy the peace of mind it brings us while traveling. Regards, Doug
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Old 03-02-2017, 08:56 PM   #27
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Ok, so follow-up post regarding alarms, etc. The default low PSI alarm is 100PSI. Since our tires run 65PSI cold, the alarm goes off at power up when it sees each tire. Easy to set the ranges. I set mine at 50PSI low and 85PSI high.

I also determined (manuals are handy for this) that I didn't permanently save my temperature setting last time. This time it's set and staying.
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Old 03-05-2017, 03:45 PM   #28
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Ok, so follow-up post regarding alarms, etc. The default low PSI alarm is 100PSI. Since our tires run 65PSI cold, the alarm goes off at power up when it sees each tire. Easy to set the ranges. I set mine at 50PSI low and 85PSI high.

I also determined (manuals are handy for this) that I didn't permanently save my temperature setting last time. This time it's set and staying.
If you are running TPMS on trailer tires the Low pressure warning should be no lower than the pressure needed to support the actual measured load on the tires.

Tire pressure in trailer application should set the Cold Tire inflation to the pressure molded on the tire sidewall.

High pressure warning can be 25 to 30% above the cold inflation pressure
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