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If you just want to lift the rear you could use the RAS that will give you an 1" maybe more if you adjust up. If you want to lift the front and rear 1.5" to 2" you could go with the V/B code spring swap. Ther is a ton of information on both here , just do a search.
Cheaper but it will not give you the same results as changing to the B's. All it will do is raise you up 2". I just did both and am very happy with the ride and the looks. I would recomend doing both with the towing you do.
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