We have a PW Plateau, built on the extended body Sprinter. It's very easy to drive, easy to maneuver and park and has a surprising amount of power. I've had no problems driving it through rush hour traffic, or out on deserted gravel roads in the middle of nowhere. In fact, I've turned it around on some pretty narrow gravel roads when we've decided that it was getting a little too rough.
It passes all the big Class A and Class C RVs on mountain roads (and most of the B's as well) without any problems at all. In fact, I just love waving at the guys in their big honking Class A's when I'm heading up mountain roads. Especially when I think about the fact that I'm getting 22 or more MPG while they might be getting 8 MPG if they're lucky!
I think you would be impressed with the Sprinter handling, whether it be a Roadtrek or a Pleasureway.
A good traveler has no fixed plans, and is not intent on arriving. ~ Lao Tzu