Im not sure what all you must do to the front of them to get the front to lay but the rear just get a decent universal kit and just modify it to fit to your liking. Build your own crossmembers if you have to. But if you plan to run big rims eventually just keep that in mind and build it to lay on what you want if you have to put tires on your stock rims that equal the total diameter of the rims and tires you plan to run in the future (easiest way). Then just buy an air management kit or piece one together. Tank, compressor, valves, air line, fittings, gauges, bag brackets, bags, switches. Run the biggest bag you can. You will like it a lot better, smoother and less pressure needed to lift the truck.
I just got one of them Air Zenith OB2s, cant wait to try it on my Suburban. Its faster than 2 Viair 480s. I dont like viair, i have had too many problems with their compressors. They do work good when they work though.