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Ford has a real high boiling point fluid that is the accepted hi-po fluid. Second to that is Performance Friction's Z-rated fluid by 2-5 degrees. The superduty came with DOT3 and not some fancy silicone based fluid, so a heavy duty dot3 will be fine.
I've used whatever DOT 3/4 fluid is on sale at the time I needed it and have had no issues. It takes about 1.5 quarts to do a full flush including replacing what's in the master cylinder reservoir and then cycling the ABS dump valves and bleeding each corner until clean fluid runs out.
A pressure (not vacuum) bleeder makes this an easy job.
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.