Have a 2" leveling kit on the front and what appears to be the stock 1 1/4" block on the back. Would like to raise the back for towing. Tried air bags but they made the truck way too bouncy when hauling, even at the minimal amount of air required to level the truck. If I go with a 2" block can I run the stock rear shocks or do they need to be swapped out. Or should I swap them out anyways? Looking at the Bilstein 5100s but there appear to be two different part #s, 24-285896 and 33-238319, one looks like it is only for a 2" lift and the other for 0 - 2", any benefit to one or the other?