The fact that the charger when to max charge indicates that the batteries were discharged, but then you knew that already. Since the charge is backing down, the batteries are recharging. I would tend to let then charge until the charger is down to 3-5 amps, then disconnect the terminals from both the charger, from each other and from the coach. Wait for about 30 minutes, then take a voltage reading on each battery. Then, similar to Richard's suggestion, wait for several hours and recheck the voltage. You may find that a good long slow recharge will bring all of the batteries back.
If these are not 'sealed' batteries such as AGM's, make sure that distilled water is added to each cell before recharging.
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