6000 watt is 500 AMPS DC input. So your alternator ratings is OK as even 480 would supply approx 5300 watts or 44 AMPS AC for your Air conditioners. But make sure you size the cables from the alt to the batts and batts to inverter per the wire tables for gauge and length. Those are very serious current amounts, What is the inverter size on the newer coaches that run dual Air Conditioners. If they do it then there is another reference for sizing. Check the fan noise on the inverter, it will need high CFM also with ducting I would think
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