When I researched bike racks a while back, I found that the main reason that most of the rack manufacturers did not recommend using their racks on the back of a TT had more to do with the problem of swaying bikes and not weight restrictions. There can be a lot of exaggerated movement at the back of a TT due to road conditions, and that movement can toss bikes around quite a bit. I did find discussions saying that if you want to use a bike rack on the back of a TT that you should use one that doesn't just dangle the bikes from the bike frame, but rather use one that anchors both the bike frame and the wheels, to minimize swinging/bouncing. There are several racks available that hold the bikes in this manner.
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2013 Wind River 280RLS, 200W Solar
2013 Ram 2500 Laramie Cummins 4x4
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