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I wonder if it's the long single swing out and how it's supported/latched. I made mine out of 2x3 3/16" and noticed it still wobbled a lot even with nothing on it. So I added a 1" block of steel to support it. Latched down I don't see this thing moving at all. I don't think Luke's design includes anything to support the weight of the arm opposite of the spindle. And with a big tire on it, the movement is exaggerated.He's saying the 2x2 arm twists... that'll be a function of the mounting point distance to the spindle shell. It takes a pretty ridiculous amount of torque to deform a 2x2 square tube of that wall thickness. Even if the spare tire weighed 200 lbs and the center of mass was 24" above the centerline of the tube, that's 400 ft/lb of torque under 1g of acceleration or braking... you could be ridiculous and say it's subjected to 5gs of lateral acceleration and you've got 2000 ft/lbs of torque on it. Still not enough to plastically deform it. I hang my 37 off the back of it and it moves less than the body does.

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