We have a 2017 Wildwood 31KQBTS that we bought this Spring. We towed it home with our 2016 F150 3.5 EB and it was a nightmare. Excessive sway and I couldn't get over 50 mph. It felt very unsafe!!!!
A week later, we purchased a 2017 Ram 2500 HD with a 6.4l. It's a huge improvement, the Ram barely even knows the trailer is back there. If I encounter steep hills or heavy winds, I will feel it back there, but the Ram is setup to handle it.
I still have some fine tuning to work on with the weight distribution setup, but we just towed 400 highway miles and it was comfortable.