I bought a 2017 T6 about 18 months ago, it had been a works van for 3 years doing about 75k miles in that time. All VW services, history of it being nicely looked after. Then it was sold and bought for conversion which all in, took around a year, then the owners before me had it for about 3 years and put on about 10k miles in that time. From memory, I think mostly that was in the first year of ownership. So I bought it with about 85k on the clock, but it hadn't been used much for 2 years. I started using it weekly (maybe a few times a week) and have had quite a few issues (alternator, egr cooler, egr cooler pipe, leisure battery, abs sensors, etc). In hindsight I would definitely go for a van that was still being used regardless of mileage vs one that had been sitting around unused.