We will camp for five days in a row several times this summer. I only have one battery and probably would be fine for five days with the one right? As far as leaving it plugged in between trips it seems pointless to leave it for long periods. In the past I have plugged it back in a day or so before the trip. I have always been very conservative with the battery when we dry camp. Lowsuv I don't know a lot about diesel but am assuming you have 2 batteries in the diesel and 2 in the TT. I want to get a good battery that will last five days of camping with conservative use and want to be able to keep it as long as possible. I am getting the idea that a true deep cycle rv battery with high AH would be the best for my situation.