bodied s10 offset ?

i found some 20"x8.5"  with a +10mm offset for a friend with a bodied second gen s10 .  Is the 10mm offset fit okay?

It should be fine. I run a +16 and a friend of mine runs a +6, both with 20x8.5 and we both clear. Mine has less problems hitting the fender, but not by much. I would run a narrower tire like a 225/35/20 or a 235/35/20.