I have a 2001 Silverado 1500 with a 5.3ltr engine 3.73 rear extened cab truck and it has been great so far. I rented a bobcat yesterday and trailered it home to work on my Son's practice track. Since I am planning on buying a bigger trailer I took the oppertunity to try a couple of the big mountains towing the bobcat. I pulled 2 mountains about a mile long with a 6%+ grade hitting the bottom at 55mph in second gear at 3,500 RPM, toppong it also at 55mph and the flat towing was fine. The trailer I was using did not have brakes and this really concerned me, but it stopped better than my old s10 blazer pulling my 6'x12' trailer with our gear and 3 bikes in it. I stopped by a local gravel plant to find out what the actual weight was and my grose weight with the bobcat, trailer and truck, was 13,140lbs 140lbs over the GVWR limit. I am going to weigh the truck this afternoon to see excatlly how much it was towing.