Besides a WDH, Deavers help a ton. Get the HD ones for towing. No, it doesn't increase capacity, but it helps with the squat. Less squat equals more weight back on the front axle. It also stiffens up the rear a bit (in a good way). I'll also say that when my stock BFGs were getting worn out I replaced them with Cooper AT3 XLTs which are Load Range E and I felt that made a noticeable difference in towing as well. You can run more PSI in the back when loaded and they feel a ton more stable.
The biggest thing you need to keep in mind is tongue weight. Weigh-Safe hitch has a built-in scale so you know exactly. Be smart with how you load it. Raptor will tow/pull 5,000lbs easily, but not when your tongue weight is 1000+.
I know its not a direct comparison, but I just got back from a 3000-mile road trip in mine (1500 of those were towing - Helped a family member move). I drove from FL to ME, picked up a 6x12 Uhual, and loaded it to the brim with boxes and a lot of furniture. I even put a few boxes in the bed since I have a tonneau cover. Then I hit the road again for FL. I was worried at first. Thought it was gonna be White Knuckles the entire way. Reading some of these people's responses will do that Lol. But I was extremely strategic with how I loaded it. And honestly, I felt it did great. I kept cruise control between 67 and 73 almost the entire way. No sway at all. Even when passing semi's. Plenty of power, and the brakes were fine.
Here's a pic from one of my stops, and yes, this was fully loaded. Very little sag because of how I loaded it. The other pic was when I finally pulled back into my driveway in FL. Not bad average MPG considering it had a trailer on the back for last half.