Right now I have 265/75R16's on all four corners, with good "speed rated" P's on the front and crappy "load rated" LT's on the rear. (I don't think I've had four identical tires for longer than a week over the last 15 years.)
At the time it seemed that 265/75R16 was about as large as I could go on the front without rubbing and I wanted the same size on all four corners.
Now I'm on Maui, have no spare tire any more, don't have opportunities to drive 100+ MPH any more, but I need to haul heavy loads all the time. So I need to reshuffle things and plan ahead.
I'm considering going back to stock-sized LT235/85R16's on the front and going to thicker LT305/70R16's on the rear. And then carrying a LT235/85R16 as a spare. Any reason I don't want to do this?
If a 305/70R16 is 32.8" diameter, and a 235/85R16 is 31.7", would that be too big a diameter difference to use together on a limited slip rear end, in a flat-tire type situation (no more than 100 miles, probably closer to 20?) (I have an open diff right now but I want to fix that soon... I'd like a 4.11 LSD.)