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I think the op is feeling the bow wave effect when the semis pass, IMHO you will never get rid of it completely.
I would suggest a Hensley hitch to help if you cannot go to a larger truck.
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Steve 2023 Ram 3500 6.7 Cummins (aka towing beast) 
2022 Keystone Sprinter 32BH
B&W Companion
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