Rear Leaf Lift?

I’ve got a new to me project, 14 CM SR5 with stock leafs in the rear , RC 2” front coilovers and RC rear shocks. Need /want some rear rake . I tow a bay boat on the weekends and get some squat , and prefer the slightly raked look over level anyway. What does everyone recommend?
1. RAS
2. Coachbuilder shackles
3. Icon add a leaf system
4. 1 or 1 1/2 lift block ?
I’m not sure what’s the best option?

 

RAS would give you about an inch of added height plus stabilize the load.

 

Do you have them ? How are they? They just look like a contraption to me lol