I love my Pressure Pro. First bought monitor and 8 sensors in 2007. Put on my SUV (TV) and on dual axle TT. Once trip was over, seemed silly to have sensors on TT while it just sat, so put them on wifes car. Bought extra wiring, and moved monitor to wifes car. Worked great, but switching monitor between cars was a bummer. Bought a second monitor, now it is much easier.
Monitor has a switch for TT, or TV, or both. Works fine.
Note sometimes pull a cargo trailer, and when going far I just move sensors to it. Since they recalibrate for new pressure in about a minute, that works great. Takes me longer to move them than that.
I keep expecting sensors to need batteries, after all they are 6 years old, and used full time 24x7x365, but so far so good. When I do need batteries it costs $30 each to get sensors exchanged with fresh batteries.
Every time I have called with a question it has been promply answered. I'm a happy customer.