I suppose it depends on the kind of sensor, but, for mine, the tire had to come off, as the sensor for the trailer tires is the same kind in my truck's tires: so you had to have it installed before mounting the tire, thus they're in there when they get balanced. (Plus, it sometimes doesn't take much weight, strategically placed: could a sensor actually affect the balance afterwards? Maybe?)
My suggestion is to have them as they'll be going down the road when they get balanced.
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-Leslie
WBCCI #1051
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