It's not an option on the build sheet...but as you have stated, people did get them on their Ventanas. It's a Special. To add a special...yes, the dealer must pass the request to their designated sales rep at Newmar...who in turn relays it to Engineering. The Engineer either approves it, or not. Back to the sales rep., who passes along the cost to your dealer...then onto you. The problem that your likely facing is your "build" specs have probably been finalized...they've arranged the components...and I'm guessing they are probably assembling the coach within a week or two. So, as your salesman pointed out...they'll probably have to set back your build date and delivery date accordingly. It certainly would be a better opportunity now than later if it's something you cannot live without. They'll likely add to your specification removal of drawers, an added circuit, and additional plumbing. Mr. Engineer is very particular about these details...they don't "wing it". After market add-on would be very expensive due to the modifications necessary to retrofit your existing build. Sadly, you'll probably have to decide if the added delay is worth it all in the end.
I had a devil of a time getting a non-inverter powered outlet added to my coach. The engineering approval was a hassle. Luckily, we were touring the factory when our coach was being wired. The electrician tracked me down and asked if this was my coach...and what was I using the circuit for. It was refreshing to get an opportunity to speak directly to the guy that pulls the wires. Long story short...it turned out exactly as I was trying to explain to the Engineer...thru my salesman, thru his sales rep at Newmar,,, etc...
I realize the system is not perfect...but having said that - I know of no other company that entertains as many special request from Customers as does Newmar. We just have to play by their rules.
Charlie & Ronni
2016 Ventana 4037