If you do ANY amount of camping without hookups, I would HIGHLY recommend a pair of 6-volt golf cart batteries to replace the single 12v battery. You will get MUCH better use from it. I got mine at Sam's Club at a very reasonable price.... If you only camp with hookups, it probably isn't worth doing....
2014 RAM 2500 Laramie 4x4 Quad Cab w/Cummins Turbo Diesel, 2009 Rockwood 2607, and 3 'yaks!
300W of Suntech Solar, a Rogue MPT-3024 Controller, and a Xantrex PW2000 Inverter