Originally Posted by hafer6
My head is still spinning a bit with all the different Sprinter types and options, but I'm sure I'll sort it in the time I have to figure it out. If anyone can tell me if Airstream makes a model that sleeps more than 2, I'd be appreciative.
Among the Interstates, if fuel efficiency is one of your criteria, you'll want to stick to 2009 or earlier models. They were built on the Sprinter 2500 chassis, and had the smaller 5-cylinder engine. Fuel economy is about 2~3 mpg higher than the later models. But if you're looking for low emissions, the 2012 and later models use DEF to reduce the amount of sulfur compounds released into the air through the exhaust. Fuel economy isn't as good at only 18 mpg or so, but total emissions are lower. So, two different ways to "go green." Or as green as an RV gets.
I doubt you'll find any Sprinter-based RV in the US that sleeps more than two as marketed, unless maybe it's a Class C built on a Sprinter cab-and-chassis with their own box on the back, or a mini-class A built on a Sprinter chassis. For something like that, you'd have to take a step down from Airstream to a competing brand, though.
However, there are a couple of very enterprising folks here on the airForums who have figured out how to build a bed out of an Interstate's front seats, to sleep a total of four inside. And if you don't mind the added setup time, the Fiamma Privacy Room (available separately) adds an 8×13 room under the awning where you could set up cots.
Also, many campgrounds allow you to set up both a tent and an RV in the same campsite. I've seen it at several capsites, where the parents or grandparents sleep in the RV and the kids sleep in the tent.
So, if it's just a matter of sleeping arrangements, your options are wide-open.