It's all a compromise, what SDP and VW thought was acceptable with regard to the COG of the vehicle, roll centres, weight transfer under braking and acceleration, predictable safe handling and blah blah we've done this all before.
As max'n'cad observes, body lift keeps the drivetrain and suspension box:standard, so factory roll centres are unaffected for safest handling but the COG will be raised, so handling will still be compromised to some degree.
It's a big job, since at the front you have to cut off the upper wishbone mounts and move the whole lot down by the same amount as the drop on engine and transaxle mounts. You also have to drop the rear swingarm mounts down to preserve the andgles The potential to get it all out of line and make the van "crab" or any number of nasty things is considerable. IMHO.
But...the resulting increase in arch clearance means you could run bigger diameter tyres and gain a bit on approach/depart angles (assuming the engine can pull the increased gearing) and so gain more ground clearance that way.
Or you could try travelling lighter, let the wagon sit up at the correct height and all of which has precious little to do with poor quality CV boot rubber.
Nighty night

1985 Oettinger 3.2 Caravelle RHD syncro twin slider. SA Microbus bumpers, duplex winch system, ARC 7X15 period alloys