btw, the 07+ Expy has the same front suspension as a 04-10 F-150. You can grab a $70 leveling kit for one of those trucks and it will bolt right in.
the only difference between the years is the material used for the lower arms. 04-08's are aluminum, the 09+ are stamped steel.
edit: with that in mind, I don't see why you couldn't do a 2" leveling on all 4 corners for $150-200