The 6V batteries are far more rugged and will take much more abuse. They also will take many more discharge/recharge cycles. Also if you completely discharge the 12V batteries they will be ruined whereas the 6V batteries handle this without problems.
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Dave & Barbara
KenWorth T2000
2005 Mobile Suites 38RL3 #2338
MorRyde IS 8K axles, LazyBoy recliners, LCD tv
Full time since '96
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