The 2018 Grand Cherokee Trackhawk just became the fastest SUV in the Jeep lineup. Equipped with a supercharged 6.2-liter Hemi V-8 that produces 707 horsepower and 645 pound-feet of torque, this Trackhawk launches naught to 60 in just 3.5 seconds. That's no easy feat considering this SUV weighs in at 5,636 pounds. Other features include all-wheel drive (duh!), 8-speed transmission, paddle shifters, adaptive Bilstein shocks, Brembo brakes and 20-inch wheels.