Here is what I am leaning toward after reading replies and doing some research... Note, my thoughts on rear suspension are more adventure tuned (rough roads, canopy on top, towing a trailer) than rock crawling & dune jumping.
New Leaf Pack, with rear shocks that better match my Kings up front.. Seems simple, but I bet I'll be out $1500+ all said and done... Archive Garage's leaf pack is intriguing, but might call Deaver direct to see what they say as well.
In the meantime I am just going to add my OEM overload spring back into my OEM leaf pack with the Wheeler's Progressive AAL kit and get some mileage out of my Bilstien 5100s.
I think when the 1st Gens came out the AAL kits worked pretty good for my intended use. 10+ years later the OEM leaf packs are showing some age and a new pack seems to help make that up and add to the OEM capabilities at the same time.
If I decide more off road capabilities are needed I would take a hard look at the Archive Garage Shackle Flip.
Here is a good write up
@Flyer69 did on his rear suspension mod. He is is still looking for shocks that fit, so curious as to what sizes he finds out he ends up needing.
https://www.expeditionportal.com/forum/threads/flyers-02-tundra-adventure-build.157655/page-7