I don't see why everybody has problems with SXs. I have 36x12.5 SXs and they are balanced, and ride smooth. Also, they are showing barely any wear and i have had them on my truck for about 6 months now and they were on a fullsize chevy before that. Then again i only live a mile from the school so my truck only sees about 20 miles a week.
Just don't expect much from a swamper on the street, and you won't be disappointed.