FWIW, you also have to be careful with what "others" can do to your RV batteries after you purchase them.
For instance, yesterday I dropped our RV off for repairs that could take up to a week. Just in case, before taking it in I removed the two brand new AGM batteries I'd installed a week ago. I didn't want any personnel mess ups or misuse at the repair facility (leaving a roof fan on by mistake 24/7, using their 12 V computer in it during lunch hours, etc.) to deeply discharge the new batteries and for them to discover it and then merely charge them back up before I picked up the RV. Why risk having a deep - or worse yet a complete run-flat - cycle put on those brand new batteries that might permanently shorten their life.
Am I paranoid about workers and workmanhip - you bet.