I know the Bilsteins are highly recommended for the 2500/3500's. I just replaced the shocks on mine with them. $70 a piece at Geno's. My rear sits up 2-3" higher in the rear due to the heavier springs. I find I get better gas mileage that way because I am always going down hill. But, evens out when I am hitched up to my 5th wheel.
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