Good advice. Thanks.Minefield? Yes absolutely...
In case of any help, my decision process played out more or less as follows:
1. Like bigger wheels (in my case, even though a new van it came with 20’ wheels...won’t explain why unless asked, but I liked them anyway)
2. Bigger wheels look a bit silly on standard ride height
3. 30mm VW lowering would improve look whilst maintaining dealer warranty, but compromise the ride even further than 20’ wheels do in any event...not acceptable
4. Opt for non-VW approved lowering, in my case 40mm H&R + Koni, accepting that VW warranty on suspension will be replaced by slightly shorter KONI and H&R warranties (my van was quite new), but I may be exposed if issues were to arise withdrive train etc (e.g. if CV joints were to fail, would Vw honour the warranty or claim that non-approved work invalidated it?
All of this can be avoided of course if you are happy with the standard wheels and ride height - believe it or not there are literally hundreds of thousands of VW van owners worldwide that would never give it a second thought or spend any energy searching for a forum about vans, yet their vans don’t habitually fall over or are laughed off the road
...but then again, if you wanted to be sensible you would have bought a bus pass already
I‘m frantically Googling “Air on T6” following @Texxaco ’s assistance on this!..... still not gonna happen, but I can dream!