I have a Class C rig with 6 X U2200 6V interstate batteries, they are about 5 years old, well taken care of, toped off regularly. This spring cleaned the corrosion off the terminals and did a regul...
200+ watts of solar and a good controller would be topping them off every day. Probably bring them back to life. With 6x GC2 I assume you are camped off grid a lot and the solar would really help there too.
If you have a problem with corrosion and it is getting worse it might be a sign of battery aging. Or an updated converter with lower float voltage would help. Do you fill to 1/8" below the split ring? Be sure to use a cleaner and then protectant when all put back together.
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