The Ram 2500 can be powered by either a 6.4-litre gasoline HEMI V8 or 6.7-litre turbo-diesel Cummins inline six-cylinder engine. In the case of the Ram 3500 model, the same two options are offered under the hood, but there’s also an upgraded version of the Cummins that generates 400 horsepower and as much as 1,000 pound-feet of torque. Maximum towing capacity with this big rig is rated at 15,921 kilograms (35,100 pounds).