Chevrolet 2004 Blazer Owner's Manual page 253

Dolly Towing (Vehicles with Automatic
Transfer Case)
If your vehicle has an automatic transfer case, your
vehicle should not be dolly towed. Your automatic
transfer case vehicle should be either dinghy towed or
placed on a platform trailer with all four wheels off
the ground. See "Dinghy Towing" previously for further
instructions.
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