Sounds like you're well on your way...
If you didn't already know, a few tips I've picked up on the way with these:
If you need nicer, or decide to go after spares, for the middle row seats, or, want to switch captains chair/bench one way or another, there's two types - 2000-2002, and, 03-06. Supposedly the mounts and lever latches work differently and don't swap without changing floor provisions (I assume cutting and welding involved from what I'm told.) Also, the shorter door yukon/tahoe/escalade not a donor for the 2nd row, but is for front. Middle is yukon xl/burb/escalade esv.
There's 2 cat and 4 cat versions of the exhaust on the 8.1, but, it was computer selected and not a california/federal emissions split thing. What headers are out there don't work on the 4 cat version as they end in the middle of a converter. It can be changed, but, needs plenty of work because you supposedly lose sensors along with cars and need to mess with things. Doable, but, just know what you're getting into before spending money.
Since you're towing, be cognizant of your rear ratio. It'll pull anything you put behind it with ease. Having driven both, the 3.73s feel every bit as strong as the 4.10s. However, gm rated the 3.73s 2000# less in gvwr and the dot nazis could give you an expensive lesson over it.
If the 10000# vs 12000# rating matters to you, well, there's guys who do things with stickers....just mentioning.
Door jamb stops at 45psi even though elsewhere, at least in my manual, says 80psi rear when towing. Tire monkeys need to be reminded, especially since you're towing. Or make sure yourself anyways.
With relatively minor adjustments in the front end/grille you can put a HD series hood on the truck which really changes the aggressiveness appearance wise, if you're into it...