Ah but you are quickly filling that void of knowledge.
The kit in one of the threads is a good idea for ease of maintenance if you plan on keeping the coach. Not sure I would pick one up in an emergency if you don't know if the cells are dry or not.
You'd be better off putting a battery disconnect on--but that is a preventative measure that wouldn't help you in your current situation.
Now that you know where the battery is and how to get access I think I would try to jump it from another battery or vehicle. If the coach isn't plugged in then it would be pretty easy to jumpstart the generator via the house battery(ies) in the step, let that run a while and see if you can get the emergency start button to work (remember you have to hold it down while cranking).
I'd suggest you download and read Ed's excellent crowd sourced Axis/Vegas owner's manual (some of this is included in that) found here:
http://www.thorforums.com/forums/f10...nual-4961.html