I leave all batteries in their place fully charged with no load on them Have been doing so for years. After 5 months of no attention they are fine.
2012 Chev 4x4 Crew Cab 5.3l 3.42 trailer package
2011 Jayco Select 28U
gone 2003 Chev 4x4 5.3 Extended cab
gone 1991 Award Classic 30