I hav a '99 Q cab- afe intake, 275 hp tst inj, 4" exh, edge box, boost and pyro gauges, 354 gears, 285-75-16 rubber with a pullrite 5th for a short bed and a 38' fifth wheel that weighs in at a tad over 12,000 lbs. Last weekend I brought it home from the kids placs-a little over 15 miles. T he...