I have both a K-Tag and a North Texas toll tag on both my Explorer and pickup. They will not both read, its either one or the other and I have had one read on the first gantry and the other one on the next one.
My NTTA tag I believe is good in Oklahoma and Kansas as well as everywhere in Texas. I have a K-tag on my MH as the most I use tollway is in Kansas and its good for a discount on their tolls.
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