2020 GMC Sierra HD
JACKSON HOLE, Wyo. — GMC has just introduced its full line of heavy-duty trucks for 2020 at a media drive event in Jackson Hole, Wyoming. Engineers at the event emphasized that the new trucks are the most capable heavy-duty truck they’ve ever built, and promised world-class towing capability, out muscling the likes of Ford Super Duty and Ram HD with a class leading maximum towing capacity of 35,500 pounds.