One more idea as I stair at a spare leveling valve sitting on my desk. Assuming you do have a air leveling valve, what if is was defective or the assembly that operates it. If it were loose or jittery could it osculate at a certain speed. I also say the same for your shock absorber. The absorber valve can be bad and not leak oil, it can also have a blown out bushing.
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2007 Country Coach Tribute 260 Sequoia
40' DP w/Cat400, F494513, Lithium Battery & Solar
Live next to Yosemite
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