I have a new chevy silverado 3500HD dually, and it does not have a TPMS system from the factory. Saw there are several systems aftermarket for the trailer, and the truck. There is one from TST, Doran, and from tire safeguard. Has anyone had one of these? Do you recommend it or not? Looks like they tell you to replace the tire valve stems with solid ones if you mount the wheel sensors. I was considering the 10 channel unit which would monitor the truck tires and the trailer as well, and gonna run like $500.00.