Original owner of 1981 FJ60. Everything original until recently. Installed oldmanemu system now want to upgrade wheels and tires. I bought Rock Crawlers with 3.75 and 3.50, but they hit the calipers bad. I don't want to shave the calipers ande prefer not to use spacers. What wheels would the old pros suggest would be good. I'm not a rock or mud hound. Just nice sedate off-roading. Is it possible tpo go to 16" wheels?