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I have had the standard alternator and now have a truck with the Heavy Duty option. Both have worked just fine for my towing needs along with my lights, a/c music and wipers going. Duals are a nice option but I wouldn't think a necessary one for the application.
If you buy a truck with the supplemental cab heater it already comes with the 200 AMP alternator. Just a thought. I am one of those guys who would rather have too much power than find out I don't have enough.
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.