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We like the TST507 with flow through sensors.
Strongly recommend you get a system that does NOT require the wheels to be in motion to activate the sensors. While this might save the battery life on the sensors, it means you have to be on the road to "check your tires" - or you have to manually check them with a gauge after being parked.
The TST system allows you to check your tires at any time without the wheels being in motion. This one feature has saved us before - while camped, a trailer tire went flat after picking up a nail while parking. With the hydraulic "level up" system, we didn't see the flat. But the day before departure, I turned on the TST system to check everything and it immediately alerted me to a flat. That gave me a day to get it fixed at my own timing. With other systems, I would not have known until we were in motion or unless I had manually checked each tire.
So this is an important feature to consider in selecting a system.
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