When I bought my truck, my wife and I were RVing and planning on buying a larger RV. Not knowing what to expect, I ordered my truck with the 6-speed and 4. 10 rear end. Now we've had the RV parked in a river-side vacation spot and we no longer tow anything. I am now driving my truck like a car (a VERY LONG car) and I'm wondering if I'm hurting anything by not flexing its muscles once in a while. I've got almost 40,000 miles with no problems, but, knowing the nature of diesels, I hope I'm not clogging her up or something. Any comments? Thanks! 
