I find the choices split on the 510 vs the 507.
We bought, and still use, the 510 system which we bought 5 years ago. For me, I liked the shape of the monitor. Dutch didn't want to bother replacing the batteries in the sensors every year and the 510 has a 5 to 7 year battery life and all of ours except one, which I replaced, are still working. When that lifespan ends you send in the sensor along with $20.00 to TST and they send you a new sensor.
RE the metal valve stems. If you have more than 80 pounds of air in your tires or the tires are 3 years old you should have metal valve stems installed. It didn't take us but 180 miles of traveling to have a low tire alarm go off. Our tires were a bit over 3 years and the rubber valve stems had started to dry rot so any sensor would cause it to move around and the cracks from age caused a slow leak. We were in Vegas at the time and found a tire shop that installed them right away and for not a lot of money.
The 507 sensor has a battery life span of 9 to 12 months so you do need to replace those yearly but the monitor does display when the sensor battery is failing so you should have fair warning. The upside of the 507 is if you are traveling and have a sensor fail, you can replace the battery in the sensor yourself {if you carry spares which I recommend} and get back on the road. They are a bit of a pain to change out but not totally awful. Be sure you have spare o-rings which should be included in your purchase before you take the sensor apart. The can and will disintegrate so check 1st that you have them.
On the 510 side, you do have to send the sensor in but with priority mail, you should have the sensor back in less than a week & are good to go another 5 to 7 years.
The 507 are definitely water resistant for rain and driving thru sat a flooded road. If you happen to also tow a boat that you need to launch you would definitely want the 510 sensors as they are waterproof.
It really just depends on which system you feel best meets your need. Hugs, Di
I am planning on getting a TPMS for me travel trailer. I am thinking of the TST 507. It seems like a popular choice and from what I have read on here and in RV forums, it seems to work well.
It looks like I will want to get stainless steel valve stems to better handle the weight of the TST sensors on the trailer wheels.
Does anyone know of anything else I should be concerned with or have other observations on trailer TPMS?
Thanks!