Classic Trucks For sale. OldCarOnline.com is a renowned classic truck trader. Below, you will find listings for classic trucks for sale; including: Chevrolet 3100 from the 1950's; Dodge, Ford, and Jeep from the 1970's; and a wide selection of trucks in between. If you are looking for Classic Trucks for sale search our classic truck listings. Nov 03, 2016 · With a minimum towing capacity of 13,000 pounds, the Silverado 3500’s turbodiesel engine has serious power—a massive 900 lb-ft of torque, to be exact. This big pickup can tow up to 23,000 pounds in its six-tired, dually configuration, and the steel frame is sturdy enough to support more than 7,200 pounds in the truck bed.