Forgot to clarify that the vans were Long Wheel Base but you are right that's still not on the UK brochure (VWMY18TRANS, Issue: 1 November 2018, https://www.volkswagen-vans.co.uk/c...enditions/original./transporters-brochure.pdf)
A possibility is that those vans were equipped with uprated suspension (which seems to be a possibility here).
Other factors might include aux battery, bigger main battery, bigger fuel tank (but not in this case as not an option here).
Thanks for highlighting this
Its all good information and further reinforces why people should always check their vehicle vin plate for axle loads before assuming a certain wheel/tyre combination will be suitable for their van.