I figured out why sticker says 1040 lbs it deducted 2 passengers weighing 150 pds each to equal 1340 pds to get real allowable payload. Then I deduct weight of passengers/cargo. It will be tight. Thanks again.
Passengers are never deducted from the listed payload. Never.
The payload listed in brochures is a theoretical best-case scenario for your model truck with a very specific (read: stripped) set of options.
Adding options - leather seats, sunroof, etc, etc, reduces available payload.
The GVWR is the same for all models of your specific truck, regardless of trim level. It is literally "the maximum weight allowed on the contact patches of the four tires".
The payload for *your* particular truck was arrived at by weighing the truck as it rolls off of the assembly line ("curb weight"), and subtracting that weight from the GVWR.
In summary, the brochure payload represents what it *could be* - if you special ordered the correct configuration - while the payload on the door represents what it *is*.
Also note that anything that you put on or into your truck reduces your available payload. Toolbox in the bed? take off 150lbs. Cooler in the back seat? that's another 35-50. Wife? Couple of dogs? Even bed liner. It all adds up.
Add to that the fact that the listed "dry weight" for the trailer is useless, as mentioned above. That is the weight as it came out of the factory - with none of your food, clothes, dishes, bedding, cornhole game, etc, etc, etc.
Put all of this together, and YES - you absolutely need a WDH, and NO - you probably shouldn't be towing that trailer with that truck. (I get that people do it all of the time, doesn't make it a good choice).
Good luck!