Unless the Ford hauling the trailer through the surf was a 1999 7.3 diesel, then it was a V-10 looking at the plate on the fender. I've towed a few Cummins out of the mud and snow, not because of lack of power, but due to the manual tranny(Dodge automatics don't last long) and Cummins having too much torque in mud and snow; they get burried in a nano-second.
2008 F-250 4X4 Lariat V-10
2002 Airstream Classic 30' w/SO #2074
2007 Kubota 900 RTV
1996 Ford Bronco
2007 Lincoln LT