The 2020 GMC Sierra 1500 AT4 4WD Crew Cab Standard Box's towing capacity is rated at 5488 kg (12100 lbs) / 1036 kg (2285 lbs). The Sierra 1500 AT4 4WD Crew Cab Standard Box wheels measure 18-inch ...
The 2020 GMC Sierra 1500 Base Regular Cab Long Box's towing capacity is rated at 4536 kg (10000 lbs) / 1034 kg (2280 lbs). The Sierra 1500 Base Regular Cab Long Box wheels measure 17-inch in diameter.
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