Bought a set of LT275/65 R18 Wrangler AT/S's for the truck and just finished an 800 mile round trip tow with my 29ft TT. Happy to report that they are much better than the stock S-RA's! Way more aggressive tread and way more solid under load. They are slightly small diameter, but considered within spec for the rolling diameter as they do not affect the speedo. Could not be happier!