If you decide to use a solar battery maintainer you will need at lest 5 watts per battery, probably better to have 10 watts, any less and it will not keep the batteries topped off.
If you get a 10amp plug in battery maintainer you can just plug it in every week or two, get one with a quick connect that you can leave connected to the battery all the time,
Even if you decide just to start the bus every week or three you still need to experiment to make sure whichever method you use is working, to do this just charge as much as you think is necessary, let the battery set for 6 or more hours without being charged and then check the voltage, 12.6 or 12.7 is great, 12.5 is ok, anything less means you need to charge more the next time, then you will also need to see how fast your batteries discharge and this also takes some experimentation with a volt meter.
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