Ray, yes the engine weighs more, but that is not even 1/2 of the issue. The diesel just has so much torque that just off idle it will walk away from a gassser. Like I said, look the difference in torque curves.
My 2002 truck weighs 8000# loaded and has a GVWR of 11500#, leaving me a real world 3500# for pin weight. If I go back to the curb weight on a base truck, the pin weight allowed is over 4000#.
A 3/4 ton, crew cab diesel (Ford of Chevy) will scale out close to 7300#. In order to have a pin weight capacity of 3000#, the truck will need to have a GVWR of 10,300#. Are they rating 3/4 ton Chevy and Fords that high now?
You can ot go by the brochure data except for very rough approximations and need to make allowances for added weights and equipment.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot