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Just go to your local RV shop, Auto parts or online at www.e-trailer.com (click on electrical and then adapters) and get a 7pin-4pin adapter that plugs into your existing 7pin socket on your truck allowing you to then plug in your 4pin plug. About $10-12 dollars.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.