There are few batter mfg in the USA. SO any US made golf cart 6v battery shoud be fine. For bigger bucks the Trojan 6v , usually found on boats is a better product, but any batt needs to be operated properly.
A genuine deep cycle batt will have a "20" hour rating , finding a CCC or MCC rating means a starting or multi purpose batt which is NOT good for camping use , avoid them!!!!
If you boondock a SOC (state of charge) system should be installed as it is the ONLY "gas gauge" for battery charge that is easy to use.
My favorite,,,,there are many others.
TriMetric Battery Monitor - - Bogart Engineering
www.bogartengineering.com/products/trimetrics.html
○Measures battery % full, based on amp hour measurements for accurate information on
state of charge (
SOC). This method is more accurate than monitors ...