I just talked to the Tire Patrol people.
First and very important to me their system circuit boards and all are made in the USA.
Second the tire sensors go to a very low transmission rate when the tire is stationary. The gentleman I talked to said you can still get the tire pressures before the trailer or Motor Home is moved.
I asked about the frequency used and it is a WIFI system and has a much longer range than the current systems on the market.
Third the sensors are hermetically sealed. Battery life is expected to be about 2 years. For $10 they will replace the battery and upgrade the sensors postage paid.
Forth I like the monitor that displays all tire pressures all of the time. A quick glance at the monitor gives that priceless feeling things are good.
The system is not on the market yet but will be in a couple months. This is a system I will be following as it looks like the way to go when it is available.