I ran 37x12.5x15 SSR's on my TJ and got over 50,000 miles (no spare in rotation) out of them and still sold them on Craigslist for $200 when I was done. They had very good on road characteristics and kicked butt in the sand and mud. They never saw snow or a rock so I can't speak for how they do there. They balanced easy, wore even and weren't too loud. I'm thinking about getting the Swamper M16's for my JK.

 

I ran two sets of 35 12.5 SSR's. I liked them alot. Fairly quiet for such an aggressive tire, good siping for wet pavement traction, ok in mud, great in snow. Got 28,000 miles from the first set, then had another 14,000 on the second set when I traded for the JK we have now. We did rotate and balance them on a very regular basis though.