You all have a nice trucks! Heaviest thing I have ever hauled/tow in the bed was a 2010 Polaris Sportsman 800cc ATV which was close to 800lbs fully fueled. Plus another 200lbs of ice fishing gear, 4 people in the truck including me with an average weight of about 180 lbs, so in total that's about 1720lbs. I also had 2 more ATV's on a trailer behind me, which was probably another 1600lbs give or take including the trailer. The entire load was close to 3320 lbs if I had to guess. The truck rode great and it pulled fantastic, hardly knew anything was back there. I have a 5.0 with 3.31s.

I have also pulled a 3800lb holiday camper behind me with a 150lb paddle boat in the bed with no issue at all. But then again the truck is rated to tow 8000ish lbs.
I love doing Heavy Hauling Jobs!