I put about another 1500 miles on this setup and here is what I learned. There is too much slop having 2 receivers; even with the rattle clamps. Part of the issue is loading down the car drops the rear ride height and that multiplies the slop out at the end of the basket. I am going to pull the basket's 2-inch tube in closer and redrill the pinhole; I can come in about 8-inches and still open the hatch. The next step will be to cut a 10-degree V notch out of the top of the 2-inch tube, bend the V closed, and then weld or bracket the V closed; that should raise the tail of the basket to an acceptable height.
Overall I loved how the basket worked. I got rain & snow for the first 300 miles...no water at all in the box. I used common sense and retightened the straps after the first 15-30 minutes or so. After that, no loosening but rechecked at gas stops. I got 41 mpg across the trip; no loss of mileage; didn't expect any loss. I did move the license plate up after tagging it on the ground a couple of times. It now lives on the same holes but screwed into the bottom of the plate, not the top. No pic of that...next time.
As far as noise goes. With my phone on Bluetooth playing music, I can't hear any difference. Without music, I can hear some light sqeekys and rattles, but nothing I would not have expected. Without the rattle clamps, I imagine it would be quite an audio show out back.
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