I bit the bullet and went for the Yokohama Geolander AT G015 275/55R20...
Have a 2014 TDI with Air Suspension (all stock). The previous rubber was Kuhmo AT 265/50R20 and had no issues whatsoever over 50,000 kms.
To say that the fit of the 275/55R20 is snug is spot on. Have only driven about 30km but so far no rubbing driving regular highway, suburbs, corners, speedbumps.
I did notice a little bit of rubbing when I reversed out of my driveway in 1/2 to full lock - out of my driveway with the rear pushing up a hill (so the front of the car lower, taking more weight). But only ever so slightly.
Other than that, it seems all good.
Running in Normal air suspension mode. Will run it in for the next week or so and see how Sports mode suspension goes and then report back.
Thanks for all the information - a couple of posts in here pushed me to move up to the 275/55R20 - so thanks!