I think it depends on where you plan to tow. I don't have that setup, but I have a 2000 half ton pickup, only towing a 4500lb trailer, plus gear. Local I have no problems. Crossing the Sierra though, I struggled Westbound up the steep grade on Hwy 120 from Hwy 395, heading into Yosemite. My theoretical max towing weight rating is close to what you have. But after that experience, I would never try it with a heavier rig. Your 2006 may have a stronger engine and better gearing so your experience may be different. Since my future plans include a bigger trailer, I am planning to get a 3/4 ton truck so I don't have issues crossing mountain passes. If you mostly plan flatter trips, I think you're fine! Good luck!