Okay, I really didn't want to. Had no choice. That or nothing at all.
I did it. I pulled the trigger. (I said trigger not finger, and it wasn't a fart...)
I just purchased the equivalent 35" tires.
I have been looking EVERYWHERE for BFG 285/75R17's KO2's (all-terrains). They can not be found!!!

I can't find anything in either the A/T's which is what I'm preferring, or M/T's, which I currently have or sizes at all that are even one step up or down in size/diameter.
There are no BFG's near my size around, period. Nada, zip, zero.
If I go down to the next available size in either an AT or MT, I'm going down over an inch/inch and a half in diameter smaller. If I go larger, the closest I could find was at my local Costco store, they have 315/70R17's which equate to about a 35" tire.
So the difference in size is:
285/75-17 KM2 (my current tires): 33.9"; tread width: 8.6"; weight: 67 lbs
315/70-17C KO2 (new tires): 34.5" difference= +.6" or .3" deeper into the rear of the front fender. tread width: 10.6"; weight: 62 lbs
So as you can see my biggest concern isn't diameter, it's width.
I'm sure I'm going to have some rubbing, so I guess I'll be pulling my baby sledge hammer and pounding some weld seams.
And for any who are thinking about suggesting another brand, sorry, I'm a hard core BFG fan.
ALSO!! I have a NEVER been used 285/75R17 spare tire for sale! Since I'm getting an all new size all around.
I will not ship. Cheap!! Gone.