What rear lift I need to avoid sag with load increase

Very very very good point, but you’re not talking me out of modding my truck and burning my cash.

Is two axle alignment best alignment after lift?

 

wasnt tryin to talk U IN or OUT of anything
U have choices

consider wisely
1 inch is hardly worth the time effort $$$
unless we are talkin girlfriends

a shop that can& does 2 axle alignments................... only way to go

there are many bad cases & frustrations guys lookin for a modification
ending up with a truck that wont stay in the road
because they went cheap
or a shop that does cars
no less they have NO experience/Expertise on 4x4s

choose Ur own poison

 

Yep, you make sense 100%. I'm not going to get the job done at some local car shop that will not ven use a torque wrench.
My intention here is not to "lift" but figure out a suspension that is similar to what is on TRD PRO and holds constant weight, and 1" lift is I think withing Toyota factory specs for rear axle angles and front ( red pro is 1" lift front, so seems like a safe bet here).

I'm intentionally not messing with Toyota engineering, just looking to do a direct swap for of parts that made the SR model more affordable. I think it will worth the improvement, or I will just realize I burnt cash and will know from my experience not to do this again.