I know that the 31x10.5x15 tyres fit the standard rims without rubbing, so I used that as the bench mark.Since you have a lwb gen1, can I put on 255/70/15 tyres or will they rub? Should I rather go for the 245/75/15's?
I used The Tyre Calculator to compare the three tyres: Both are smaller than the 31" tyre, so they should work.
The last one (245x75x15) is not a common size.
If you have the 3.0 V6, I would recommend the 31" tyre.
