Took the liberty to look at the 2014 Ford Towing Specifications. Below are the maximum capacities possible with the configurations shown below. Please note these are maximums and are heavily dependent on cab style, wheelbase, 4x2 vs 4x4, gear ratio, etc. (One must really be careful how the truck is configured with the F150 to achieve these values)
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Link to F150 Specifications:
2014 Ford F-150 | View Towing Specifications | Ford.com
The newer F150 with the "Heavy Duty Payload Package" seems to be very capable from "Fords" perspective.