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Mine's an 07 3500 4 x 4......I don't put any more than 35# in the rear tires unloaded. I looked at the tires for wear the other day and I wouldn't be surprised that I could air them down to around 30 with no problem.
If you're running around with 50# plus in them, it's gonna ride choppy.
Mine actually rides dam nice for a 1 ton.....



Did the same with my dually.....30-35 and 65 when loaded with the 50 footer

Rickster