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Others have replaced the leaf spring shackles to lower the rear end to level it out. If you aren't going for a bigger, taller truck, that should be a good option. I'd guess a lot of the stuff that works on the 09-10 (maybe even back to the 04 model year) would work on the 2011 models.
Near my work, there are several parking garages that my truck is just barely able to fit into with the stock suspension. If i was looking for a leveling kit, lowering the rear would work much better than raising the front. A buddy of mine "leveled" his Sierra 1500 with 3" front, 1 " rear kit. It was less than a month before he forgot and got himself some nice scratches on his roof in a parkade.
It does seem that raising trucks is more popular, but there are applications where lowering is more practical.
Several years ago at the SEMA show I saw a 4x4 F350 that was used as a highway tow rig for a race team. It was lowered a long way, and it looked awesome.
If you lower the rear by using a shortened spring shackle (easiest with a 4x2), you also have to add a tapered shim to correct the pinion angle or you may have problems with driveline vibration or premature u-joint failure.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.