We have 275 35 40 R20 supermetal tridents. No issues with rubbing and insurance co fine. With coilovers (VW supplied Eibach) the ride is sure footed and comfortable certainly not crashy over bumps.
I wouldn’t get them on standard or sportline suspension however but with well specified suspension they really are good so don’t believe the naysayers who maybe haven’t experienced the ride first hand.
Before I bought them I did ask VW Breeze and here is their reply-
Yes you can fit 20s to your vehicle as it is a T30 so the load index is perfectly for your axle weights and also the vehicle is a class 4 MOT. If you had a T32 you can't do it as they require a minimum 104 load tyre that no company makes in a suitable size for Transporter.
If you buy the tyres and wheels from us then the workshop will fit and balance with no charge however we would recommend a geometry check that would be £75.
The only other thing I would say is that the wheels take 4-6 weeks to arrive and we would need payment before we order and once ordered this is non refundable as we cannot return special order wheels.
20 inch Tridents £774.52+vat £929.42inc
2753520 Goodyear F1 ASY2 £663.20 £795.84inc
£1725.26 supplied and fitted
Additional Geo check and adjust £75+vat £90inc
I hope this helps.