Check water. Fill if necessary.
Charge. If it goes to float, then disconnect. Check tomorrow when surface charge is gone.
Put batteries in camper.
I was a mechanic for the first half of my career, I have dealt with more batteries than I care to think about. What I put above? That's my twice a year battery maintenance routine. If something acts up, the hydrometer comes out. Not before. I feel it's easy to take the charm out of camping when you start worrying too much about hydrometer readings, etc.
Now-2014 Sierra 346RETS 5er BUB
Then-2002 Keystone Springdale 286RLDS TT
Nights camped in 2014-28, 2015-127, 2016-10