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I have pulled 7000 lbs of generator (300-350 lbs tongue) with the jeep CRD without any WDH and no problems... I have pulled a 7.5x20 enclosed box at 7000 lbs and 1200 lbs tongue (scale sheet to prove) and the front wheels were perfectly fine on the ground.
I also pulled my Mariner on a Uhaul car hauler (3800 lbs plus 2400 lbs) with a 97 Grand Cherokee... LOTS of sway until I reloaded the trailer and pushed the wreck a bit further forward. I wasn't happy with how it looked pressing on the rear axles, but it rode just fine at highway speeds. Before adjusting, I couldn't exceed 55mph without sway starting to happen, even on a flat straight road. The Jeeps' springs are 250k miles old and tired.
A weight distributing hitch is designed to counter excessive ball (tongue) weights and or weak tow vehicle springs, to forcibly pull the frames of both back to horizontal.
If your trailer and tow vehicle are riding horizontal, then the forces will remain horizontal while you are starting or stopping. If the frames are NOT parallel to the road, stopping (where the trailer 'pushes' on you through the ball) will instead 'push' the ball closer to the ground, LIFTING the front wheel weight from your vehicle and reducing your braking and control. Obviously, this is not desired.
Doc is not incorrect in his desire for proper tongue weight, but simply using a pat formula does not take into account all the variables. Your images don't look terrible to me at all, and the biggest question: How did it pull? If you felt sway at a certain speed, you need more tongue weight.
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TRAVELING CRD TECH. I come to you!
Need help? Just ask! I've taken it apart more than most.
Email jeep [at] maincomputer [dot] com - BOARD MESSAGING IS BROKEN
Over 225 CRDs currently driving with my valves, timing belt, rockers, or ARP Studs.
Bad noises = REALLY bad things.
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