Hi Dave, I have the Merc lwb, and being honest I would prefer the mwb.
I have the fresh tank slightly forward of the rear wheels,
and when full the front end does skip a bit on corners which isnt great.
Been thinking about submounting the machine on top of the tank, would give more
room, then might look at getting the taller narrower reel for over passenger rear wheel arch.
Dont know much about the Crafter, but sure being a VW it should be reliable.
Happy with quality of my Merc