I have a 2012 full size 3500 crew cab. I did the Leveling kit and added slightly beefier "meats". I went with 285/75/R17's and love the look and feel so far.
I did the simple thing and just took my truck to the Les Schwab shop and had them do the lift and tires. Again, I love the look. The ride is still nice...
here is a pic of how it looks like now ... .
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Negative Cummins12V98... . I thought of that, I tow and haul heavy. I also added a load leveling suspension kit.