It's impossible to tell for sure, but looking at your second photo, it appears that your trailer is sitting "nose high". If it is, that is contributing to your trailer sway. It should be sitting "level" or better yet, "slightly nose low".
Take your truck and trailer to a paved parking lot like a church parking lot or a school parking lot. schedule a time when there is little/no traffic and find a level spot to park.
Measure your trailer both in front and in the rear. I like to use the "J-wrap molding" since it's relatively level from front to back, even though the J-wrap tends to be "cut and molded to give a slight rake to the trailer, visually reducing the appearance of bulk"... (sales and marketing input to help sell trailers)...
Once you know the trailer is the same height front and rear you can "assume that it is level (front to rear). Then measure the "trailer coupler" to get the correct height. Don't be persuaded to use the "standard 19" or standard 21" because "all travel trailers are ......". Measure your trailer, when it is LEVEL and that is "YOUR hitch height".
Then set your weight distribution hitch shank so the ball rides slightly below the trailer hitch height.
After you have the trailer and the hitch "on the same level", then go about carefully following the procedures to "adjust your weight distribution system to attain the proper tow vehicle front measurements.
I think you'll find that your trailer will tow much better, especially if the appearance in your second photo (trailer nose high) is really as it looks.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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