One thing's for sure, Texas got duallies; back when I was building my old '96 GMC ext cab wrecker a buddy of mine from Philly (who was also in the repo biz) told me "they're going to see you coming a mile away, you should run a single wheel truck." My response to him was that this is Texas, everybody has duallies, it's not unusual to see them....and in fact if you don't have one you just might be a fag.
BTW this is the old wrecker, should have never sold it. Was a great truck. '96, all power, 7.4, 4L80E, and I had a brand new Sneeker wrecker unit installed with Airlift helper bags too.
Richard