I got one of these to tend my 6 volt AGM. I really like it, as it seems well engineered and the materials/workmanship seem way better than the generic Walmart quality crap you most often find.

http://www.amazon.com/NOCO-G3500-Ba...8-20&keywords=6+volt+battery+charger


1941 Chevy 1 1/2-ton WW2 4x4 dump truck
In the Stovebolt Gallery
Lots more pictures