If I go with a 2" or 2.5" levelling kit can I also put a add a leaf or something in the back to stiffen it up a bit,and what kit seems to work the best.I'm thinking of ditching my stock 20's for 17's and want to know what backspacing I need and what size tire I can run with no rub issues?I'm new to dodge and when I go over a bump my front end seems to bounce like an old crown vic,is this normal or do I need new shocks?Thanks for the help.