What kind of trailering system does GMC Sierra have?
What kind of trailering system does GMC Sierra have? Luckily, the ProGrade Trailering System is still available with other trim levels of the 2021 GMC Sierra, including 1500 SLT, 1500 AT4, and 1500 Denali trims, which get it as standard, as well as 2500HD SLT Crew Cab, 2500HD AT4, 2500HD Denali, 3500HD SLT, 3500HD AT4, and 3500HD Denali trims, all of which also get the feature as standard. Why did GMC Sierra stop using prograde trailer? The 2500HD SLE and 3500HD SLE previously offered the feature as an available option, while the 2500HD SLT Double Cab previously fitted the feature...