Opinions wanted on tire monitors

I have Tire Traker and metal valve stems. They add an extra measure of confidence and safety. Especially like them on the towed and carhauler.

I do not have these, but I wanted to make sure that you have steel valve stems to mount them to if you do end up buying them. If not, they will bend your rubber valve stems over as you drive down the road and eventually give you a flat. Ask me how I know. ;)

They might be better than nothing but you have to look at them before you start towing. You could use a gauge to do the same thing. I like the monitors that let me check the pressure while going down the road. It also gives me a audible warning if one gets low. TST is the brand I have but there are other good ones also.