Before I confirm the tyre sizes, I must say this: Anyone who chooses to run tyres that are not fully load rated for the vehicle does so at their own risk. I don't recommend it, but I understand why people would choose to do so in some circumstances, such as on a demo/show van to get the most out of the drop available from the air suspension.
With that out of the way, fronts are 225/35 20 and rear are 265/30 20. They give very, very similar sidewall height and the 40mm difference in width works really well on wheels that are 38mm different in width. You get a very consistent profile and stretch front and rear. The 265 width at the rear does mean that the van sits higher when aired out than it might do otherwise. If I put one of the fronts on the rear it will be about 10-15mm lower aired out and get the most out of the ultra low bags.