That book is useless. What they need to do is publish the GVWR and GCWR instead. Who cares how much a truck with 1/2 tank of fuel, no extras, and a 150# driver can pull. The ratings are phoney and make some pick out a truck without the proper knowledge.
2000 Quad Cab 2500 Auto w/4:10 rear end. DTT 89% VB, TC, Mag HI-TECK Pan, Smart Box, EZ, PAC Brake, Pillar gage mount with EGT, Boost, and Tranny output temp, Miller Manufacturing Truck Bed Cover, with RBW 5er hitch, and
Rigged to tow a 29' Automate 5th wheel.