This text was not translated, because it is originally in English Chevrolet SIlverado HD, Ford F-Series Super Duty, GMC Sierra HD, or Ram HD? Which is your favorite? Although the heavy-duty Chevrolet Silverado and GMC Sierra received substantial drivetrain and chassis updates in 2011, exterior and interior styling was unchanged. For 2015, GM’s heavy-duty pickup twins get more than just styling updates including new cabs, and rear-step bumpers seen on the 2014 Silverado and Sierra 1500 models. Now that we’ve driven the Silverado and Sierra heavy-duty pickups, we want to know how you think they stack up to the Ford F-Series Super Duty and Ram Heavy Duty pickups for today's Thread of the Day.