What Jerry is trying to say is that a cooling fan will draw more watts than the stator can put out.
An 80W fan isn't a whole lot of airflow, and it's as much as you can hope for with a stock stator.
A 10min on/60min off duty cycle would net you enough charge to run a 500W fan for those times you might need it.
That can be translated to 1min on/6min off too, or however you want to figure it.
Not sure what the best size fan would be for an LT, but a 10A fan is going to draw about 120W of power.
A motorcycle or ATV fan would be a good place to start.
Best bet is to grab a few large lipos and run straight battery power instead of a charging system.
If you're running a 120W fan, a 10amp/hr battery at 12V will provide 1hr of continuous operation, while a 20amp/hr battery will give you two hours.
Size your battery capacity and fan draw to match the duration of your fuel tank, and you can swap out for a charged set with quick connects while you're refueling.
That way you can keep 100% of your stator output reserved for lighting.
You don't have to go with lipos though, you can run a garden tractor battery for budgets...it's just that a lipo pack can be charged fully in 10min by connecting it directly to your truck's battery (just be sure truck is not running), and they're the lightest as far as capacity per pound of weight.