On the newer GM's, I believe somewhere around 2015, they used electric steering that DOESN'T turn off when you turn the ignition off. Consequently, the steering can try and correct itself while towing if the battery is not disconnected, eventually ruining the steering.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2024 GMC Sierra 1500 Denali 4x4 6.2L
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