BFG E rated tires are 10 ply. More for towing or handling heavy loads .She has KO2 now and in snow and rock crawling they just didn‘t seem to work as well as KM3 which I have on mine, but smaller basically a 32”x10” wide. When I was there I was more concerned about getting a wheel she liked that would provide enough offset to clear the suspension etc. and didn’t think about the rating. Started thinking about that last night and they are rated E2, not sure the exact difference between E1 and E2. I may call them Monday and see if they have the 33” in a C rating. I know mine are C1 rated but they are smaller. Not sure how much rider difference there would be as a DD. I’ve warned her that the Jeep will probably handle a different with a more aggressive tire pattern and being about 1 1/12” wide than she currently has.
The C rated tires are 6 ply .
I have 285 70R 17 which is classified as a 33”. Mounted about 32” with 30 lbs of pressure .
If I recall that size wasn’t available in a D . Well for a K02. Maybe D is available for a KM3. But def would go C.
Noticed right away when I got new tires . The C rated tires were much smother . Once I hit the gravel roads is when I really noticed . Night & Day my friend .
I’m assuming the backspacing on the wheels is 4.5”. It does stick the tires out more than stock . About 1 1/2” as you mentioned. Don’t think it effects handling so much but def gives better clearance for lifts, larger tires , and one ton ends mounted on drag link & tie rod .