The Trojans are probably the best you will find for deep cycle rv use. They are also quite expensive.
I have had very good luck with AC Delco Voyager deep cycle batteries. I just had one that was 10 years old finally fail.
Deka/East Penn batteries are also very good.
I have a genuine "Battery Tender" that is a charger/maintainer. You can buy from motorcycle shops and Walmart is now carrying them in my neck of the woods.
I rotate mine around from 4-5 stored batteries every winter. I move them from 1 to another every week so every battery gets a maintenance charge every 5 weeks or so.