Try a call to MorRyde tech line.
Same for trailer mfgr tech line.
Nothing to lose.
BTW - your thread title will attract the curious, but many may pass it by..
Suggest trying a new title, with the "problem" - for better exposure.
Ex: "Help for Bouncing Truck!" (or?)
Also - since duplicates aren't allowed anyway, maybe a *new* thread in Tow Vehicles using something similar:
Ex/s: "Help for bouncing truck when towing", "Suspension problems when towing"
Then (you could) link it to this thread, say why it's linked - or ask the Mods for assistance.
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