Theroretically, anything can be done. I would advise against stacking spacers for safety reasons, but its your truck. Check out the JKS ACOS (google it), they are adjustable front spring spacers and will level out your ride.
I believe they are adjustable to 2.5" , but don't quote me on that. We installed a set in my buddy's 1999 Jeep a few months ago. Check to see if they have them for your application.
i wouldnt stack spacers, 2.5 inches is the maximum you can go with spacers without having to change the upper control arms, however if your looking to lift your truck cheaply around the 4 or 5 inch mark you could go with 3inch lift spindles with the spacers, this way you wont have to change out anything except for maybe new shocks, should only run about 400 which is cheap for 4 or 5 inches of lift
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