nice diagram bansil.
you need to design your electrical system by figuring how much you are gonna use while tailgating.....then times it by a bunch.
list out your appliances and the hours you want to run them....
then build a battery bank big enough
120v appliances will need an inverter and gets fancy... but anything is doable
this calculator helped me a lot.
http://www.altestore.com/store/calcu...ad_calculator/
there are a ton of good threads on electrical.
like this:
http://jackdanmayer.com/rv_electrical_and_solar.htm