Todd,
Guest is the only charger I have ever used that I have not had to worry about how long I leave it plugged in. I've used some really good ones in the past, but until I tried Guest, I really wasn't completely satisfied. I just replaced one after several years of faithful service, and the only real complaint I had is that nobody had it locally - I had to order it. I'd recommend a 2631A for your 3 bank (10 amps per bank), and a 2620A for your 2 bank (also 10 amps per bank).
Advantages to Guest that I have personally witnessed:
1) Faster charging times than any of my previous brands.
2) Fully waterproof.
3) I've NEVER overcharged a battery with a Guest. Never had a case swell, battery heat, etc...
4) Longevity - The one that just went out on me lasted longer than any other I've owned.
All the best,
Glenn