09 4wd Tahoe Hybrid- wheel size and lowering options

Anyone have any experience with these? A buddy of mine just bought one and whats to lower it and either put 22's or 24's on it, but wants to drop it some as well. I would imagine they have torsions on the front and coils on the rear, is that correct? Belltech lists spindles for it, but nothing on the rear. He wants to bag it, but I would imagine there is no room on the front if it is torsions. The back is no issue, I would think.

Any thoughts? What size wheels and tires would look the best? Money isn't really a problem so what ever the best for it would be the way to go.

We put more 24s on these with a 295/35/24 tire than anything. As for lowering it coils in the rear is normal however some have had the small airride kit on them. In the front just set of 2" keys works out great.