I guess I have to accept the fact that FLA batteries are "wear" items -- they don't last forever. I give them as much TLC as I can -- never over-discharging them, always recharging them fully as soon as possible, keeping them on a trickle charger, checking water and SG, etc.
This last set of batteries lasted five years -- I would estimate 400 nights of camping during that time (80 or more nights per year). Decent life, but I have heard of others who got much better results than I did.
It could be that my usage was a little tougher than average, because we usually experience about 20 nights of subfreezing temps during each camping season. We also tow the trailer on rough forest roads almost every trip -- it could be that the bouncing is hard on the components of the batteries.
