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We got this hitch tightener. It's just a U-bolt & a plate, but very hefty & it really made the hitch quieter & solid feeling when going over bumps..Mission Automotive Hitch Tightener for 1.25" and 2" Hitches - Heavy-Duty, Easy-Install, No-Rust - Made in The USA https://www.amazon.com/dp/B01597QPL6
Great discussion. My son seems to think getting a solid hitch rather than the "tubular" one I currently have would reduce the noise. Any thoughts on this idea?