I am buying a rear leaf spring upgrade!

Hey TW, I’m upgrading the rear suspension on my truck! After squatting low with my camping gear all last year and feeling a bit unstable with my painting gear this spring I decided I shall upgrade the rear suspension before camping season this year. I’m posting this here in celebration mostly, but also comment if you can help me make a good decision.

Info: camping gear approaches ~500 lbs
Painting gear probably ~400 lbs
Aluminum cap weighs like ~100 lbs or less and it’s on full time
I would like to restore some rake to the truck, I put coil overs from a 2016 TRD off-road so it’s up an inch or more in the front, I have the rear struts from the same 2016, and TSB leafs currently
2006 regular cab 4x4
I do painting 4-5 weeks a year and camping ~6 times per summer, other than that daily driven with no load usually, heavy hitch rack and bikes sometimes

What do you guys think?
I want to buy a new leaf pack, kind of a one and done solution in my mind with a good compromise between level load capacity and not too stiff of a ride.

Do I need new rear shocks? Brake lines? Whatever it is I’m installing it myself, tips?

Thanks!