Tuna,
I bought the 4 tire system. I use it only for the trailer's tires. I
bought it after I had a blow out. The repair quote was $800 or so. I
now drive down the road and see the pressure come up as the heat in the
tires builds up. I also watch the temperature of the tire. In my case,
the front set of tires run hotter than the back set. The tires on the
sunny side run hotter than the shady side. It is all very interesting.
I have learned this after about 2 or 3,000 miles. If I see a
temperature go much higher than the other 3, I will know I have a
problem. Also the alarm will sound. I have seen info at
www.tirerack.com. I would not hesitate to recommend the system. As I
said earlier, The whole system is 1/3 the cost of the repair.
bill
25 ft TradeWind in WV