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Hi Bear,
A TV has 4 wheels on the ground, and 6 wheels for a dually. Then if you want to monitor the spare it's 5 or seven sensors. All Montys have 4 wheels, and then there is a spare. Some heavy duty trailers have three axles which adds two more sensors. Some folks only monitor the trailer and spare with will be 4 or 5.
As you can see, one can have up to FOURTEEN sensors on their rig combination with just what I mentioned to cover all wheels and spares.
And if you think about other towed vehicles for RVs, double tows and the numbers of wheels in those combinations, I always thought a system with 16 or even 22 positions was strange until I realized all these possibilities. And now, I hadn't even thought about considering monitoring spare tires for anything. It's an owner's choice how much they want to monitor and that's a lot of possibilities.
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