We're taking a closer look at this pre-refresh Chevy Silverado Trail Boss LT and refreshed GMC Sierra AT4 in the following GM ...

The AT4 will be the highest-riding Sierra, with 2 inches of additional lift thanks to lifted coil suspension and new 35-inch tires. AT4 models will also share a number of features with GMC’s ...

GMC’s electrification efforts come into ... The off-road-oriented AT4 trim gets a 2-inch suspension lift and 35-inch all-terrain tires mounted to 18-inch rims. Rear-wheel steering is also ...