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.

The 2020 GMC Sierra 3500HD Base Regular Cab Long Box's towing capacity is rated at 9752 kg (21500 lbs) / 2050 kg (4519 lbs). The Sierra 3500HD Base Regular Cab Long Box wheels measure 18-inch in ...