I towed a 19' lightweight TT that was just under 4K ready to go with even some water on with a Sonoma 4.3 V6 Crewcab for two seasons. Even went over the Rockies and back. Used an equilizer hitch and added a trans cooler. Had to move to the truck lanes on the long grades but always made it.
08 Trail-Lite 8230
2011 Silverado 1500