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I would change the engine oil. I would also change the tranny fluid, the transfer case fluid, and both differentials. The drivetrain has vent hoses to let the fluid expand, but water can get in these if it gets too high. I would also pull the carpet or mat out of the interior.
If you take the sparkplugs out, and squirt a little wd40 in the hole, it should be fine. It would have to sit a long time before it started pitting the cylinder walls.
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.