If you are looking for 55w to just keep batteries topped off, take care of the parasite loads, and occasional use, they should be enough. You'll still need to plug-in or run a generator for those long rainy evenings playing games or watchin the tele, as 55w isn't enough to bring them back to full charge the following day.
Still a much better option than plugging in every time that youstop for more than a coupole of hours....
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