Tsweez do you have any idea what your camping style will be? How long dry camping at a time? From the mods you are talking about it sounds like either weekend dry camping with pretty heavy battery usage, or longer trips trying to minimize genset time.
Also just to get going do you have any old 12v battery you can toss in to replace the dead one, and/or are you sure the coach battery is unrecoverable? I ask because sometimes trying things out adjusts your requirements vs. what you believe them to be on paper. Driveway camping doing some tests could be handy to try some systems out.
Jim
