When I installed my Kings and ICON coils i preloaded about 2" to level out my rig. I already had my GOBI (65lbs), ARB awning (35lbs) and my BudBuilt Sliders (about 155lbs). I recently got my Wilco tire carrier so w/ my BR6 and 285 pats, I added an extra 141 lbs of tongue weight. Also add the 100lbs for the 3rd row and my weight I was carrying daily about 640lbs. I was sagging in the back (Cali lean).
So i recently upgraded to Dobinsons 701V. I got the height and got a little rake to account for my daily weight, my family's weight and accommodate additional weight for overlanding.
Moral of the story, depending on what you're planning to do with your rig in the near future (add sliders, roof rack, tire carrier, RTT, batwing awning, armor, steel bumpers, etc.) you may want to get a coil rated for a heavier load. I bought and installed my ICON 52700s in March 2020 and I recently removed/upgraded them in Sep 2020.
I don't have a picture of the before, but here is my after pic with the Dobinsons 701v.
**also, if you raise the rear keep in mind you may need to upgrade your panhard (prevents lateral movement for the axel)bar or get a Panhard Correction Kit (PCK).