The bounce is so bad on the stock 1-1/4" hitch that we can't use it stock. It tears up the bikes and I feared dropping it on the road. We added a stabilizer bar from the 1-1/4" receiver forward to the frame behind the spare tire, which greatly alleviated the problem and shouldn't void the warranty.
The problem is worse for the Yakima "gooseneck" style than for the flat Swagman, which we now have. The Yakima is in our garage...
If I did it again, I would upgrade to a 2" receiver and the stabilizer. I wouldn't put heavy stuff back there, though. It gets added to the tandem axles and off the pin, with consequences for stability and tires.
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