Knowing your tire pressure is important. It can help with fuel efficiency and expands the lifetime of your tires. What happened to us was that we ran over a nail and one of the inner dualie tires slowly deflated and ran flat causing damage to the tire so it had to be replaced. If we would have known this earlier we could have prevented the damage.
After watching a video from Chris & G Travels we decided to go with the
EEZTire Tire Pressure Monitoring System with 6 sensors which cost us about $320. Installation is pretty simple. You label each sensor by location sync them to the display unit and use the special key to secure it to the tire valve. Once you turn on the unit it will take a few minutes for the sensors to report in and display each tires pressure on the display.
You can set high and low warning and the unit comes with a rapid deflation warning that will alert you of a fast leak.