My '18 4WD RCLB 3.5 w/heavy payload/heavy tow is just a touch too high in the back for my tastes, and I'd like to drop it a bit and level it out. I've removed the factory blocks and installed a RAS system (Those mods might have canceled each other out!) but that wasn't quite enough. I know it sits high so it can carry heavy stuff, but I have to actually load that stuff in there, and a couple of inches would make a difference. My similarly spec'd '13 didn't squat at all with a ton in the bed, so I don't think bottoming out will be a problem, but are there any other issues I should look out for? Also, who makes the best shackles? Not trying to slam it, just want to make it a bit easier to load.