There is an option available to you. Ford F150 with Heavy Duty Payload package and Maximum Tow package. Those two packages coupled with the 3.5 Ecoboost and 10 speed transmission will give you approximately 2200 lbs of payload (or more) depending on model, configuration, and options. A truck built for towing and will have a curb weight less than 6000 lbs unless you go overboard on the options.
But you won't find these on any dealer lot. If you are buying new you will have to order it. If you are trying to buy used, you probably won't find one.
