I run 305/30 18 r888rs on 18x10s with low pro irs bolts and a 5/16 spacer for extra clearance but I do have extended wheel studs. I'd say you'd be fine without the spacer but the low pro irs bolts aren't a bad safety precaution
I run a 295/35/18 on a 10" wheel no issues. 30 series will have a smaller side wall. Run the numbers and make sure the rear sidewall is bigger or the same as your fronts. You do not want a reverse rake from tire sizes.
I run a 295/35/18 on a 10" wheel no issues. 30 series will have a smaller side wall. Run the numbers and make sure the rear sidewall is bigger or the same as your fronts. You do not want a reverse rake from tire sizes.