If it is 2 wheel drive it probably can't be towed 4 down and if it isn't front wheel drive it can't be dolly towed either. Check the Owner's Manual under "Recreational Towing" for what GMC says about it.
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John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
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