I just bought a 97 roadtrek and have a big concern. I am planning to be in it a lot and the air conditioning is apparently only setup to run off the generators power. I was wondering if theres a way to run it off the marine batteries or even add a solar panel system. Will that support it for 12+ hours at a time? If theres no way to do it, how hard is it to install a home style portable a/c unit in a roadtrek and will that drain the battery fast?