33x10.5x15 which is largest most agree can go on 15x6J wheels... would need to go up to 15x8 or 16x8 to feel safe with larger...but want to keep 60 more Expedition and Trail rig than rock rig...so the 33s ought to be fine. Add an aussie locker in rear...and see how she does. Really wanted the Toyo Open Country MTs...as I have some prejudices against BFG from highschool and college.....but when only three companies can be found with the size tire you need...and only one has them in stock....some things outweigh biases.
So she will sport KM2s for a few years...