I know this topic has been beaten to death as much as the silver socket thingy but I’m finding lots of conflicting information about this.  Is there a reasonably priced deep cycle that will fit easily, or with minor mods, under the drivers seat?  I see this one http://www.van-cafe.com/home/van/page_1138_125/auxiliary_house_battery.html but it AH’s are about half of what I’d like. 

You can p-mail me if you want.

Thanks,
Bryan