Re: Running dual compressors?
Yes, it is more important to have the hi-amp alternator putting out the amperage you need for both compressors. This way, it won't have to rely on the batteries to take up the slack. You can run dual compressors on a single battery system.... the amp load will be on the alternator. Your truck should be running when the compressors are running in order to get correct voltage (13.8 charging voltage), and to not drain the batteries.
2 batteries is good to have, but I wouldn't say it is necessary.
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