It is still explained intangibly by many with lots of caveats and what-if's when folks are suggesting "1/2 tons" can't pull their rating. Sure they can, but only if done correctly. That applies when using 100% ability of just about anything made. Not everything needs to be "dummy-proofed". Let the dummies figure things out the hard way.
Basically a truck comes with GAWR, and GCWR. Those are the 2 safety /capability numbers. Follow them and most trucks will be just fine. Sorry for triggering the next 10 hyperbolic posts from the bigger is better crowd......