Saw the new Airstream Basecamp at the Pomona CA RV show:
https://www.airstream.com/travel-trailers/basecamp/
Also just got an email regarding the Bowlus Road Chief:
https://mrvthebuzz.mobilerving.com/industry-edge/tech-trends/a-futuristic-creation-bowlus-road-chief?utm_source=iContact&utm_medium=email&utm_campaign=MobileRVing%20Newsletter&utm_content=MRV+Newsletter+11-28-16
So if you need very light weight and low drag, here are at least two ideas.
MOTHER SHIP Winnebago View 24H (2007 Dodge Sprinter 3500 Chassis, 2008 Body)3.0 L M-B Diesel V6 bought used with 24K miles. Toad: ROCKY the Flying Squirrel.