The only numbers that are useful off the door sticker are GVWRs (front, rear, and total)... and then only after you've weighed the truck fully loaded (passengers, fuel, hitch, pets, and all the junk you'll go camping with). Subtract those scale weights from the GVWRs on the door sticker and you'll have your real payload numbers. With most 1/2 - and 3/4 tons, for that matter - you'll run out of rear axle capacity before you hit the maximum towing limit. Also use the GVWR on the trailer - not empty or factory weight - and calculate 12 - 14% of that for a loaded tongue weight. Finally, and only after you're within the specs of the tow vehicle, proper setup of a good WD hitch with anti-sway will put the icing on the safety cake.
Rob