I don't know what the amp draw would be for those, but I find it hard to believe that it would be more than a winch and you use the winch a lot of the time at 500-600 RPM.
With the lights on you are usually moving so it would stand to reason that your RPMs would be higher. And so on and so on. I just don't think it is very accurate for them to make such a blanket statement. Sounds like they just want to make a few more coins and it obviously wouldn't hurt to have a bigger alternator and a second battery.
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