If a Sprinter is the route you want to take, a lot of people on here would recommend going with the factory 4x4 and then if you want lift, suspension improvements, bigger tires, have a ride improvement package installed by either Van Compass or Agile Offroad. A number of people have had that done and I have not read a single negative comment about either of those aftermarket upfitters. To the contrary, there has been only praise.