Factory options include 50 amp service (2nd a/c prepped), generator prepped, cross stitch sofa, slide toppers, 15k a/c, holding tank heaters, receiver hitch.
Dealer installed: 4x125 amp/hr LifrBlue lithium batteries, 3000w inverter.  provides 120v a/c to every outlet and is capable of running the a/c for up to three hours
Also includes ShadePro Vista shade awning screen, Hughes Power Watchdog hardwired surge protector. 
I've also removed the pullout closet and replaced with coat hooks and shelf for more storage (see pics).    Kitchen back splash also replaced.  Mattress replaced with Casper.