Well if your going to use the factory spare tire carrier I'd at least buy the MBRP re-enforcement kit. 315's are still going to be getting close to 100lbs mounted. Then you can get a spare tire relocate bracket that will work and longer bump stops. I ordered the off chamber relocate bracket, it works but the tire covers up the 3rd brake light and doesn't fit very snug against the Daystar extended bump stops. I ordered a pair of 1" wheel spacers. Going to try adding one to just the stock bracket and see if I can get it to fit a little bit.

 

I had the MBRP spare tire bracket before and it broke on me and I lost my spare. I think they changed there design though. I really like the design of the Rough Country spare tire btacket, it is pretty beefy and priced right.