TPMS with internal sensor

I have the TST (I think). I got the removable ones that just screw on and you can replace the batteries. I have a 38 ft. fifth wheel and just leave the sensor on the center console. It works fine - maybe once in a while it drops the passenger rear sending unit/tire, but just hold it up for a minute and it is back. They have an extender you can put in the back window or in the front of the fiver by the battery if you need it.