Thanks Chuck - I figured you'd be the first to chime in.
The ONLY reason I'm currently considering AGM is for deeper discharge - as you know from my previous thread, I'm wanting to keep my off-grid motor home warm when I'm away during cold winter nights, and 80% vs. 50% discharge would make a big difference. But we're also reconsidering our approach - might not leave it parked when the temps are going to be freezing - so that might be moot.
One question for you, Chuck: regarding charging in parallel - let's say I add two new 6V series batteries but want to keep my old ones - I guess I shouldn't hook them up in parallel with the new ones since they're not exact match?