4th gen rear sag prevention

I towed with my previous 3rd gen for 2.5 years (logged 1736 miles). I had added 5100's and a 3AAL which really helped with the rear sag on that truck.

I recently got a 4th gen and I'm getting it ready for our first outing with the travel trailer. I did the first oil change at 1k miles(will do again at 5k then every 5k) and I set up the Camco R3 WDH yesterday.

I have never actually checked the tongue weight before so I used the bath scale proceedure and determined that my tongue weight is 580-600lbs. Theres a good 4 min YouTube video on this procedure. (Pic below)


The 600lbs really pulled down on the rear of the truck. (Pic below)


This much sag has to be overcome with more preload on the arms then what was needed with my previous 3rd gen setup. I'm not crazy about having to lift the rear this high every time I hook and unhook so I'm considering options to help with rear sag.

This WDH does take the sag out though. Here's a pic when its all set up. With the hitch hooked up and set, it pushes the front of the truck down 1/2" and the rear of the truck down 3/4". (Pic below)


I haven't towed with it yet so I cannot comment on how this set up works yet on this truck.

The Tembren SES ($270), SumoSprings ($450) and
Ride-Rite are the options I discovered to help with sag.

Edited:
Has anyone added any of these to thier 4th gen? After a little more research, SumoSprings seem to be pretty appealing (except for the cost).