One size charger doesn't fit all. So you need to begin with how much battery reserve capacity you have plus how you in particular use your batteries. First, how deeply are they typically discharged according to your usage and second what level of charge do you typically have when placed in storage.
A tender/trickle/minder/maintenance charger is perfectly fine for batteries that are placed into storage with a 'full' charge....such as a tractor, snowmobile, jetski, ATV/UTV, motorcycle, airport car, weekend car, etc. However, if you run your stereo bank down when at rest, have a large battery capacity, have a large stereo, and don't burn enough gas to fully charge the batteries before trailering or docking the boat, then you need a charger with a higher amperage capacity that is ideally matched for your particular case.
The typical 2/5/10 amp home garage charger is not a healthy choice for anything but an emergency situation. I would not turn my back on one for any lengthy period and they certainly have no conditioning value.
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