2021 GMC Sierra 2500HD AT4 4×4 Crew Cab 8 ft. box 172 in. WB
2021 GMC Sierra 2500HD Denali 4×4 Crew Cab 6.75 ft. box 158.9 in. WB
2021 GMC Sierra 2500HD Denali 4×4 Crew Cab 8 ft. box 172 in. WB
2021 GMC Sierra 3500HD Base 4×2 Regular Cab 8 ft. box 141.6 in. WB SRW
2021 GMC Sierra 3500HD Base 4×2 Regular Cab 8 ft. box 141.6 in. WB DRW
2021 GMC Sierra 3500HD Base 4×2 Double Cab 8 ft. box 162.5 in. WB SRW
2021 GMC Sierra 2500HD Base 4×4 Crew Cab 6.75 ft. box 158.9 in. WB
2021 GMC Sierra 2500HD SLE 4×2 Double Cab 8 ft. box 162.5 in. WB
2021 GMC Sierra 2500HD Base 4×4 Crew Cab 8 ft. box 172 in. WB
2021 GMC Sierra 2500HD SLE 4×4 Regular Cab 8 ft. box 141.6 in. WB