Having an engineering background and always working on the latest and greatest the OEMs I have been employed with have to offer, I will continue to use FLA GC2 batteries as they have never left us without enough juice to keep RVing in 3 decades. I can simply roll over to Samsclub and purchase another battery bank for less than what I spend in fuel costs on a single out of state RVing trip, feels good knowing we have reliable 12 volt reserves for the next 7-8 years, amounts to just a few dollars a month over their lifespan.
With our class A we use the pro-fill system on our battery bank, a few pumps of distilled water couple times a year to top off batteries, no over-filling, no taking off caps, and very little corrosion buildup keeps battery maintenance to a minimum. Improper charging is the main reason for lackluster battery performance, we are extremely hard on our GC2 batteries, having smart converters and inverter chargers over the years makes it simple to just plug in and let them precisely replenish consumed amphours along with timed equalization routines.