Going down to a 15" wouldn't look all that bad if you stuck with a 7.00 or 7.5-15 tires. My 3600 had 15's, but the 3800's sit a little higher in the air. The problem may come with the 15" wheels clearing your brake drums. Don't the 3800's have a 15" drum? I recently purchased a 3800 long bed, but haven't had the wheel off yet.
