When I bought my VW T4 800 Special (special meaning cheapest!), it had fitted Audi A4 wheels which were underrated even for a 2.5T van. I bought some VW Passet Wheels to replace them which were just ok for my T4 but would have been underrated for any other model T4.
Even ignoring the PCD, ET and Centre Bore aspects, very few OEM Car Wheels would ever be suitable for a van (the only possibilties I can think of is maybe things like Range Rovers and those kind of monsters but they would be dubious).
This question comes up all the time on the VW Forums with people fitting underrated 20" BMW wheels and underrated Tyres on VW T5s.