Honestly I just check my mirrors to see if the tires have gone flat. IME trailer tires are more prone to blowouts than just simply going flat.
Some of the bigger trailers, like my 42’ 5er, you can’t really see the tires in the mirrors. I’m 8’6” wide and I do the jerk left, jerk right when it’s clear on the highway to have a peak. I’ve wanted to get a set for a while but think I’ll buy an 8 tire monitor for the trailer and truck. The 3500 GM’s don’t have tpms sensors.
I use this brand, after seeing the aftermath of a blown tire on a triple axel 5er at woodys.... they had to take the entire side off trailer from blown tire and grandpa didn’t look back!
I like my TPMS, it shows temp as well which is interesting to watch as u go thru mountains in 36c weather. The only pain I’ve found is u need to pull batteries out of sensors at end of season to prevent them going dead over winter.
I run 8 sensors, 4 on trailer and 4 on truck.
https://eezrvproducts.com