wow, did not think so many people would chime in... ... I think if i do have a blow out, i will just put the front tire on the back to match..... dont think a taller tire would fit under the truck????? not sureOo.
Up to a 315/70/17 will fit under the bed, and there are probably others who have fit 35's under there.
To fix the whole problem, I buy my tires in sets of five and do five tire rotations. No issues, no rotating tires on the side of the road, and they last longer.
I guess I'd have to see a diagram of the internal parts to follow that explanation.