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Re: too many amps, need better alt?
One thing I didn't see in your calcs are the wipers.
Very likely you could be running headlights, running lights, wipers, blower motor on max and AC + stuff needed to run the truck all at the same time. Quick test would be to turn all that stuff on at a bit above idle and watch the volts. If they stay up, you are good.
Don't worry about things like locks, windows and adjustable seats since the battery can easily supply them for the seconds they are on.
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