TST, TPMS with internal sensors

I'm ready to stop taking chances with a blow out and get a TST pressure monitoring system for my trailer tires. Then I came across the internal sensor type set up. Anyone used one of these? Seems pretty legit and straight forward. No doubt if there was an issue with a sensor you'd have to take the tire off, run it to a tire shop, then have a look.............that does sound like a pain.........if something went wrong Thoughts?

https://tsttruck.com/507-series-4-internal-sensor-systemtst-507-int-4.html