Another option now available for 2017 Roadtrek has 4x4 available on their Agile van which is based on the Sprinter 144 chassis. Also available with diesel Alde heat/hot water, induction cook top, e-trek package for solar and lithium batteries. The good news is that you can order one with the options you want and get it in 6-8 weeks vs 12-14 months for a SMB or Van Specialties build.
Honestly I think VS is probably a better built and lower price but for us anyway the wait time is too long. Also we live in New England so fire or logging roads are the most off road we would likely see. We are going with a RT Agile (144) Alde diesel, induction cook top, underhood generator (big alternator) and no propane. Perfect for our needs as a trailhead and fly fishing weekend base camp.