Yeah, my Sierra was a 2" drop, as well. The problem with the large drop is that the capacity lowers. The truck is rated for 8K+, but the hitch is limited to 5K on the 8" drop. I'm currently shopping for a higher capacity drop hitch.
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In the mean time, get yourself a proper 8" drop hitch, which is the right height for this vehicle. Honestly, you could probably get away with a 10" drop because of the way they put the receiver so high.