The ACE comes with two 12 volt House batteries wired in parallel. I like the Batteryminder charger that also has a desulfate cycle to keep the batteries in top and long performance.
You will probably need a separate charger for the Chassis battery because there is an isolator between the House and Chassis batteries to protect the separate systems. The emergency start button on your dash energizes the isolator to allow the Chassis to pull from the House.
The above assumes you want to leave it unplugged from shore power with the switch in Store, and only want to maintain batteries but as the previous post suggests it would be easier to get an adapter and just leave the coach plugged in and let the factory inverter/charger take care of everything
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