Preparation does not guarantee success, but the lack of preparation guarantees failure - old Japanese proverb
I had a similar chevy for a while- 6in lift, 35in tires, etc.
You should have tons of room for an on-board air system. not only is it great for wheeling, but running tools and helping take care of others vehicles as well. tons to gain on on-board air- will only sacrifice some weight- but in that hog of a truck you wont notice.
I wouldnt go past 4.11 gears unless your gonna make it a true off road machine. I liked going fast in my truck and i think the high gears will limit that. the 6.0 should have the low end to help off-set any gear ratio issue.
Rhino lining is way heavy- not worth it imo.
Install a sweet holster or gun stash location within reach of your seat! maybe even one for passenger!
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