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I have instrumentation to monitor each of my six 12V banks while I am driving. And since I charge with six 12V chargers, I guess you can say I am "top balancing". Since they are AGM batteries you cannot perform a high voltage equalization charge anyway...at least not with my particular batteries. I think you can with an Optima battery, but it shortens the batteries lifespan each time you do.
It is impossible to bottom balance lead acid because:
1) voltage sag is substantial even as low as 30% DOD, so it would not be accurate
2) you never want to go greater than 50% DOD or cycle life goes through the floor
3) bottom balancing would prevent stronger cells from ever being fully charged; lead acid batteries do not remain happy for long if they are never fully charged
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