I have a B&W Patriot slider that I bought 3 years ago for my 2018 RAM Short Bed.
The hitch has performed flawlessly. I have no experience other than this.
You would only need the Companion non-slider with your long bed.
I had the place I bought mine install the rails for me.
I also had them install a 7-Pin inside the bed. Very handy.
Just talked with a neighbor of mine yesterday and he installed his own rails.
Said it took him about 2.5 hours. Then he had to go to a friend's house to borrow a 200# torque wrench.
Just depends how handy you are.
I just upgraded to your truck, but a 2021. New truck has pucks in bed.
I am waiting for my adapter to arrive tomorrow.