DO NOT USE A TORQUE WRENCH TO LOOSEN NUTS/BOLTS! They aren't designed for that kind of usage unless you know the torque it will take to loosen the bolts and the torque wrench is rated for it. It's generally not a good practice, and a bad habit to get into. The right tool for the job, and all that. :)
I use a 50-250 lb.ft. 1/2" drive HF click-type torque wrench to tighten the lug nuts on my dually and the toyhauler. But I have a 24" 1/2" drive breaker bar to loosen them. If that won't do the trick then they are waaaaay overtight.