Would you consider lowering the truck...smaller blocks between spring and axle in the rear and no leveling kit in the front. That might drop the front of the camper down a couple of inches and raise the rear about the same amount. Otherwise it's raising the camper a few inches. I'm not that familiar with the method but I believe that others have added steel tubing between the frame and spring mount on the camper as opposed to installing blocks between the spring and axle.
Nights camped in 2013 - 55, 2014 - 105, 2015 - 63