I just got done looking at a set of 38" x 15.50"x 15 Super Swamper Radials and I was wondering what the groups thoughts are about these. They are used and look to have approx 3/4 tread left. I would like to have a set of 39.5" IROK's but I don't want to pass up a deal. Any input ? Bruce G. Laughner '77 Bronco