Did you get air suspension or coils?
The Rams with coils are progressive springs, which means the first inch sags quicker than the second.
Squat is not my concern, trucks are made/designed to tow best with some squat, it's more the handling. I had a hard time controlling porpoising in my truck. The coils are also more inbound (sitting towards the center of the truck) vs traditional leafsprings, which means it doesn't control heavy loads in the bed as well either, it gets more vertically "tippy" if that makes sense.
All of this can be tweaked. A properly balanced trailer is key, and running a good WDH is also important. I had the best luck with the Anderson No Sway because the chain setup it uses means there is no "spring" in the hitch itself. Traditional trunion bars (like the husky, equalizer etc) are a dynamic/spring force, and that + the coils in the back means you have two springs/suspensions playing off eachother whereas the Anderson has chains that are static force and never move.
For side to side sway, a better sway bar is key like the Hellwig. Some guys have upgraded the shocks to bilsteins and that works well for them.
Some Rams come with soft cushy tires, especially the cheaper trims with 18 inch rims, replacing those with stiffer sidewalls or even E rated tires is helpful.
My problems ended by upgrading the tires, swaybar, and the Anderson WDH. I'm not a fan of airbags or timbrens or sumo springs, they all change the unloaded ride quality. If you want to keep that best-in-class luxurious ride, then timbrens and sumos are definitely out. There is also reports of cracked frames using those devices (cracking right where the timbrens are mounted) because they constantly pummel the same spot in the frame over and over, the point of the suspension is to soak up the hits and distribute them.