I have a 6 inch lift and 37 inch tires. I have installed a steering box brace, the new style steering, and dual stabilizers. My next step is the Carli upper ball joints and Moog lowers. You might suggest to your friend to look into these things. Death wobble has been a problem with my truck after i installed my lift but with every step I get closer to eliminating it. A bigger set of tires is hard on the dodge suspension so these upgrades will help in the long run.