Hey George, 12 years is sweet! I did change my chassis batteries last year we have only 2 batteries AGM in the Frame and 4 wet cells on the house the wet cells are 5 years old and I am also on top of the charge and fluid levels. I would like to add an additional AGM to the engine starting as the C13 is a bit much for just two batteries; I have found that if I use the boost during the initial start up that everything works fine.
The Rig is still in AZ waiting for the failed engine cooling fan (Italy) I hope to have it running by the end of Feb.
I, like you am sitting here in Seattle not enjoying the cold snap, we have really gotten acclimated to the warm AZ winters. It looks like we will be in Seattle sitting out the game this year.