If you're going to custom order, skip the dealers for now. Go set an appointment with Michelle Howard to get all the customs correct. They will then give you a build number that you send to dealers for pricing.
Dealers can't seem to get just how much Newmar can and will do for custom builds. Lots get denied by a dealer, that the factory says no problem to.
Go into the Newmar section on this board and read about how some much some people are having done. All of them will happily talk to you via PM or even on the phone. I personally have talked with several about custom factory builds.
Do yourself a big favor and at least call and talk the Michelle. Your spending a lot of money, get your dream not somebody else's.
2013 DSDP 4347, all electric, 450 H.P. ISL
Air & hydraulic leveling
14 Jeep Grand Cherokee Overland toad