I have a 2003 silverado 1500 with rear air bags. The added air bags give the rear end a 2" lift and so I would like to even out the front end with a leveling Kit. I have been looking into it and I'm wondering which type I should go with (ie- torsion keys, coil/strut spacers...) I'm also due for new shocks up front. Should I take this into consideration while choosing a kit? Any help on this would be great... especially if you have done it yourself. Thanks!