I would guess that staking some lines out from each end would eliminate most of the end-to-end wobble for sure. I personally have never tried it since I built it for indoor use. I bet someone on here has given it a try though. But really the sway is not too bad once you get used to it. I was convinced it was not going to be strong enough when I started using it and felt it wobbling a bit, but it holds up great!
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