It seems as if I can't get the batteries (both engine& house) won't last but just little over a year..I try to maintain them,water,running the engine , etc, but now I need 3...in looking at the dates ...
How are they used? IS the rig they are in used often or left in storage? Are there battery disconnect switches in use when the vehicle is not being used? Do you have them on battery maintainers in storage? Do you live in the rig full time? Are you adding distilled water or tap water? How often?
Without details, I can only assume you are doing exactly what I, do, and my batteries last for years.