That is exactly the same size tire we are running, except with MotoMetal wheels. Anyway, I notice some rattling and tappping sounds this week-end from the gate area. Pulled over and sure enough, some of the spot welds on the inside of the gate have cracked. I went home and took the 6,000 lb. tire assembly off of the stamped steel tailgate and it seems fine without the weight of the wheel/tire attached.
I will say this, whoever installed (dealer) the tire carrier extension DID NOT use the extensions for the snubbers...
None the less, I still think I am looking for a better system.