Our TT stays plugged in all the time. Also, even though it is a 2011, we actually have owned it since Sept 2010 so the batteries have had a good three years. Since we are going to be staying at a non-hookup site I want to go ahead and replace them. Nothing would make my night more than getting up in the middle of the night to use the bathroom and finding out the water pump won't work! We will go out shopping this weekend and try to find the replacement batteries locally.
And Roy...I love your write ups. I'm sure you have forgotten more than I know in this area!