I've had this type of Xantrex charger on Rhapsody since 2007 and it works well. (pictures are links to products)
[Linked Image from i.ebayimg.com]

I think this is the new version of the Xantrex charger.

[Linked Image from defender.com]

It is dual bank and microprocessor controlled with "smart" charging cycles. Never had a problem cooking batteries with this like you see with some chargers.