no advice on tire size

any one help me with the up sizing of rear tires only?

 

I wouldnt recommend it personally. When i first got my prerunner it came with 245/75/16s on the front and 265/75/16s on the back. The fronts would last over 120k miles (they dry rot before they wear down the tread) and the back tires would only last about 45-50k miles. This is simply because you cant rotate them. Is there any reason in particular you only want to upsize the back? You can run 265/75/16 or 265/70/17 on stock suspension without rubbing

 

Why