After reading about it in another thread, we gave the Auto Meter BusPro-600s a try. After running it for 2.5 years we love it.
It's a little on the expensive side, but it's been worth every penny. Some of the features we like the most are:
- Removes sulfating automatically
- Each battery is on its own charging circuit
- Built-in float control so you can leave your batteries plugged in while in storage and not damage them
- Built-in reverse polarity, short circuit and overload protection