fj12ryder wrote:
"Just try to understand how TPMS work. They go to "sleep" when you park the car and will be waken when wheels start rolling. Some system act faster, some need couple of minutes to start showing. So morning walk around still apply.
Battery replacement is another story as most of them are sealed and require whole sensor replacement. But sensors are getting cheaper and cheaper."
Well, a little misinformation there. Many TPMS don't go to "sleep" when you park. They are active all the time. You can see the air pressure in the tires shortly after the monitor is activated. I turn on the monitor when we start getting ready to tear down and leave. By the time I'm ready to hook up, the tire pressures are being shown. A walk-around is a good idea as it can alert you to issues.
Battery replacement isn't an issue since a lot of them are just weather sealed and batteries are a user-replacement item. You can get TPMS sensors that mount inside the wheel, but honestly who needs the aggravation.
Absolutely as fj12ryder says. My TST will show the pressures even if my 5er has not moved in days. And standard 2032 button batteries can easily be changed in a few minutes.