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Tire TrackerYou can buy a 4 sensor system and you can add more later up to 22 sensors. I have a 6 for the MH and 4 more for the toad and when I'm not pulling the toad I use them on my single axle trailer to haul the UTV of Harley. The system is completely expandable to how many you want to add. I have used tire monitors for years and have never needed a repeater unit. I have used it when towing 40' 5th wheels an still got a signal in the truck. My present rig is only 26' long and then my toad and I don't have a repeater and have a signal all the time. I'd try it without the repeater first and see if you really need it.
