I have a 04 f150 reg cab with an 8ft bed. I have a 6" rough country lift on it. I also have 18" dick cepek rims with a 20mm offset on cooper 33's. What are the biggest tires I can fit without rubbing? I'm hoping 38's but maybe 37's. I know a lot of you have 35's. But I'm hoping to get bigger than that. Thanks for reading my post. And I appreciate all the opinions.