I'm a great fan of system redundancy. I'd rather have two 12 volt batteries isolated from each other with a multi-position battery switch than all my eggs in one basket with two 6s. While it's not as critical in trailer use as in marine use where dead batteries can leave you out on a limb, I have had almost new batteries loose a cell. If that was in dual 6s I'd have nothing, with dual 12s, just a bit of a nuisance to get a new battery but the trailer can operate indefinitely on one 12 volt battery.
I'm aware that most folks prefer dual 6s but it's really not necessary to try and convince me how wonderful that setup is.
So I've removed the dinette seat. I was going to do this anyway, it's another mod. Paint all plywood. It also makes it easier to deal with installing a suitable battery box for two 12s.
One thing that I expected to do when I lifted out the factory battery box was to seal the edges of the bottom drain hole. I was happy to see that ETI installs a vinyl hose that effectively does the same thing.
Jim, you mentioned Group 29 in a previous post. The factory lists a Group 27 battery and that's what I have. I seem to think that maybe a few years ago it was a Group 29, but not now.
At any rate I'll be out at ETI on Tuesday to trade in my entry step. If they have a larger box that will accomodate two 12s I'll get one. That would be the simplest and easiest.
Tried out for size a Turkish carpet that we had in our aft cabin. Seems like it fits nicely.
Ron