Just bought a 2 wheel drive, reg cab 4.8 ltr. GMC work truck. It has the towing button on end of the shifter. I have a 3500 lb , 20 boat and I live in the California foothills so I need to pull the boat up highway grades. Will this truck do it without burning up the engine and tranny??? dEALER SAYS YES. i DON'T BELIEVE DEALERS. tHANKS IN ADVANCE FOR REPLIES . D.G.