I also had 15x10 -45 and 33x12.5 on my last truck and cranked the stock keys and inch and a half. I did have to trim on front bumper and NorCal, but the offset was bigger that is why.
I have 18x10 -24 on 285/65 and have a pro ryde leveling kit and only had to trim the plastic valance. I’d just crank the stock keys an inch and a half or so, aftermarket keys on these trucks are a waste of money imo.
Had the subs in for 2 weeks now and no problems! Still has the junk battery (replacing soon) and voltage stays the same, everything seems fine. Didn't even do the big 3!