I'm pretty determined to put the house batteries on the passenger side frame rail, to balance the weight side-to-side and also keep as much weight forward as possible. Also want to maintain the maximum amount of ground clearance. There was a factory Group 65 battery in this location and it didn't hang down too low.
I thought I had it figured out by using 2-Group 31 AGM's laying on their side. This wouldn't be any taller than the factory Group 65 installation. However it looks like this setup would interfer with the intallation of a hoop step.
Now I'm looking at 2-Group 49 batteries. The Group 49 is a long skinny battery used on import autos. Deka makes one in an AGM. The width and height are about the same as the factory Group 65, but it is 14" long. Is there any reason why an AGM battery designed for starting wouldn't work as a house battery? They are rated 95 Amp-hours, compared to 105 for a Group 31.