Then there is always the CGVWR of pickups, which has more to do with drivetrain strength and frame/suspension strength. I think the most accurate way to assess the rating of any pickup is by this "all you can carry and pull" number. The current Dodge 3500 (no one ton here) has a rediculously high CGVWR. What is it? 30K pounds? Why did they get such a quantum leap in CGVWR? Simply the Aisin transmission can take it. No manual trans need apply. The clutch can't take it.
My 14 year old Dodge 2500 has a puny 19, 300 pound CGVWR. It came with a Camper Package from the factory with upper secondaries similar, if not exactly like the 3500 came with only without the hub extensions and dual rr wheels. Dodge would not admit it, but it was the forerunner to the SRW 3500 that came shortly after that time.
*Remember, the weakest link in your assembly dictates the capacity of the entire vehicle. In my case it was tires.
My cast iron, 360 pound NV5600 has a 26K pound rating.
My Dana 80, 35 spline, full floating has a 13,500 pound rating just on the axle.
My NV241 H.D. has an extra wide chain put in with the snow plow prep package to mitigate shock loading you get feeding back through the drivetrain while plowing. The NV241, non-H.D. gets the narrow chain, but gets the same rating since the weak link is the rr output bearing, the same on both, but not subject to shock loading like the chain.
I did a lot of searching before I bought the Dodge and came up with some surprising numbers back then.
Factory GVWR: 8800 pounds
Gross front axle weight rating: 5200 pounds
Gross rr axle rating (standard lower rated D80) 6084 pounds
Gross rr axle rating (camper package, higher rated D80) 7500 pounds
Combined standard axle weight rating: 11, 284 pounds
Combined camper package axle weight rating: 12, 784 pounds
I had to dig a deep hole to find this info.
The Cummins gen 2 turbo diesel High Output engine by itself weighs 1022 pounds. It generates a measly 245 H.P. and a pretty good (at the time) 505 pound feet of torque @ 1600 rpm. Hardly a high revving V8; puts out that torque all the way down to 500 rpm.
There are lots of components to measure and calculate to find the unvarnished load and shock load rating of pick ups. Ford is the only mfgr. that makes it easy to find out what all these numbers are. Dodge traditionally obfuscates and underrates all their stats to bow to the legal/liability team on the 7th floor corporate. Ford has no fear.
What is a 3/4 t. pickup? Just about anything you want it to be, depending on the year, the mfgr. and the build sheet. I hope this is not just another TMI.
regards, as always, jefe