Hi, Eric -
I still think that changing out the batteries is a great thing, especially if you are going to do a lot of dry camping. A standard Group 24 or Group 27 12-volt battery is just too wimpy for extended dry camping, especially when it is cold and the furnace runs a lot.
I am still concerned about the way the battery is carried in the 2720SL. The factory cuts away the upper skin of the floor, cuts out the foam core, and sets the battery on the lower skin. The skins are thin aluminum - they aren't all that strong, and I'm convinced that if you should take a speed bump a little too fast, for example, the battery could go right through the floor and out onto the road.
This doesn't seem to happen often, so maybe I'm overly conservative. But if you double the size of that hole in the floor, and put the weight of ANOTHER battery on the lower skin, I think there is potentially a big problem.
I seem to recall that Mike Laupp had a pretty good-looking solution, though I've forgotten the details.
Bill
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