I also have a same year (2008 Out Back) that I purchased new. The people here have already answered some of your questions, so I won't repeat the same answers.
I got a several options factory installed on mine: awning
, hot water tank, extended counter, flush toilet, dual propane
, spare tire, storage cover, electric brakes
, larger DC fridge (3cu. ft), door with window, fantastic fan, bike rack, gravel guard.
I later added several other "options" that I listed in the modifications discussion.
As for your power converter, probably an Elixir 25 amp model, I would advise you to check your battery(ies) water levels (if standard wet type) regularly as that converter has a "dumb" charging circuit that will boil your battery dry if connected for long periods of time.
My converter died after a couple of years and I replaced it with a WFCO-WF-8725P which is a direct drop-in replacement. It has a 3 stage charging/maintaining circuit. Works quite well.
I hope/wish your maiden trip went well.