I have been using one of these "Genius" smart chargers with great results. I just disconnect the Negative cable from the battery or coach batteries. Then attach the chargers. I just check the 120v source to make sure the GFCI hasn't tripped.
https://www.amazon.com/NOCO-G3500-Ul...004LX3AS6?th=1
If you don't have access to 120v, I would disconnect the battery cables. I haven't tried a solar charger.
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