Hi Frank, i'm late in the game on responding in this thread and i hope your weekend of visiting trailers and such went well.
I did have Chandler put in an extra 12 volt socket near the front facing side dinette seat as i knew from the get-go that we would be utilizing our rig primarily off grid and via the 12 volt onboard system.
That said... I am replacing the inexpensive (~$10??) socket with marine grade sockets as mine after 3 months of outings (five?) are all but falling apart from use. In fact, though i've not finalized my tweak/design, i will most likely take out the stock socket mounted near the galley 120v AC outlet(s) and hard wire a fused USB multiple outlet and just have the secondary one (side dinette) with the cigarette socket. We use the 12 volt system to charge all our electronic gadgets, run the MaxxFan, LED
lighting (replaced the stock incadecent), and water pumps...
we do not plug the unit in when we are off grid camping way up in the boonies...with one exception during a once-a-year egg-fest at a state park.
Best wishes on your EggVenture what ever you decide.
Thom