What is the Terrain?
The 2021 GMC Terrain is a compact SUV with two rows of seating. For 2021, the Terrain will add an AT4 off-road trim level, giving it some ruggedly styled cosmetic extras. Unfortunately, the new 2021 Terrain AT4 won't receive any real off-road enhancements to accompany the styling update. Other GMCs including the Sierra, Sierra HD and Canyon all get some sort of upgrade to suspension hardware in the AT4 package, but with the Terrain it's all looks.