I run BFG 295/50/15 Radial T/As on my stock rear T wheels. I do have to run one 1/8" spacer per wheel to keep them from rubbing the frame tho. But this is the widest tire I have ever seen on a stock Turbo T wheel.
HTH
no problems here w 255/60/15. No spacer and no rubbing. And if you wanna make them look fatter run a tire smaller thatn a 235/60 in the front. Just my 02