I run 8.5 x 15 with 3.5" BS (not 100% sure on the BS, but its the standard BS for this particular wheel).
Tires are 245/60, all 4 corners the same. I had to massage the rear wheel well flange a bit on the passenger side because the tire dit not clear.
If you want a wider tire, you need 4 to 4.5" BS



Frank