My wife and I bought a Transit last month after looking seriously at vans for about 6 months and wanting a van for several years. We won't be "overlanding" in the van, we'll use it most weekends to stay closer to trailheads for climbing, mountain biking, and skiing. Our most difficult roads will be snowy and icy or poorly maintained forest service roads, nothing offroad which is why we concluded that the AWD Transit drivetrain would be better for us than a 4WD drivetrain from either Quigley or in the MB Sprinter. Since we plan to use it mostly for Friday/Saturday nights between the weekly grind our build will be biased more towards car camping than a home on wheels. We'll keep it simple with an emphasis on flexible cargo space that includes room for motos and a bed with an adjustable height. We don't plan to have a rigid kitchen, we'll cook on a propane Coleman stove and carry jugs of water instead of having built in water tanks. A lot of our use will be in winter conditions where built in water tanks might be more of a liability than an asset. It only has a temporary bed/couch platform in it now but we're already loving the comfort that it has brought to our winter adventures in just a few short weeks.
We went for a 148" WB, high roof, and ecoboost. We bought it off a local Ford dealer but I'd probably order one "next time" as there are a handful of options that would be nice to have and a handful that we got that we probably won't make use of. We tend to keep our vehicles a long time so I don't know when "next time" will be and we'll work around any of the issues that come up in the meantime.