Why is it so important to you too know my up-fiter has nothing to do with my questions. Unless you can show cause as to why it would?
The reason CawCaw (and myself) are asking "what upfitter" is that it is not at all clear if you are/were buying a "standard" RV (such as Winnebago, Unity, RoadTrek, etc etc). If you are/were, many questions and answers would be far easier (and more correct).
If you are having a "local shop" do your conversion, all you have to do is *say that* (you don't have to say who).
But that would mean that we cannot simply look at (for example) Winnebago's information to help you in your quest.
Clarification is all we seek ... with the goal of helping
you.
The name "Sprinter" is the model name for a Daimler (i.e MB, Freightliner ... and (before 2009) Dodge) product.
((there is also a line of "Sprinter" recreational trailers ... which have
no relation/connection to the Sprinter vans))
For any Sprinter van built since 2009, you can forget the word "Dodge".
Mercedes (MB) calls the current (2019+) body style and engine selections "VS30". As 72chevy4x4 wrote, the older models were called T1N and NCV3 (MB claims that "NCV3" means "New Cargo Van". "T1N" was supposed to mean "Transporter New" (poorly translated from the German))
The "--3500 4x4, 3500, 3500XD, 511 CDI, 514 " from your data sheet tells me that you have a 4-wheel-drive
As others have written, the "3500" says that it probably has a total of 6 tires: 2 in front, 4 in back (i.e. 2 on each side on one axle).
((two wheel drive would appear as 4x2 ... 4 points of contact with the ground (one rear axle), two wheels power,))
Instead of manually typing your entire datasheet, you could attach it as a PDF (or whatever form you have) or simply tell us the VIN and those of us trying to help could go look it up ourselves.
If your datasheet has the ZG3 option, then it has the "4x4 High Range with Low range transfer case"
What else remains to be answered?
--dick
p.s. Only MB makes a "Sprinter" (trademarked name) van.
Ford makes a similar-shaped van, but it is called a "Transit"
Dodge sells a similar-shaped van, but it is called a "ProMaster"
p.p.s. the above was being written while the go-around with Roger has happening (unseen by me).
Whenever someone has a detailled datasheet then we all
assume it's Roger that supplied it, since he is the supplier of over 99% of such datasheets.