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That number on the b pillar is the amount of weight the truck can carry, not what it can tow. The tongue weight of the trailer does contribute to this weight.
Here is the info direct from Ford that will tell you everything you need to know.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.