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[smartfly10]

I have a Hurst 7'x16' two axle, 5 ton rated with leaf springs. The thing will shake the console off the seat of a 1/2 ton pickup at about 27 MPH. I always thought it was unballanced tires or just a structural oscillation when empty. But last spring I had to pull the left front wheel to replace a brake wire (dog chew toy) and when I was puting the hub back on and trying to center the wheel (dayton wedges) I noticed a wobble. Looked a little closer without the tire and noticed that the cast hub/brakedrum was actually turned crooked. The bearing bore and brake surface are parallel, but the outside milled surface for the wheel rim to seat in is about 1/4" off center. Been draggin it since '87 so I'm not gonna change it now. Usually have it loaded anyway and then it's not noticed, must be buffered by the springs.
By the way, the trailer was stripped painted and new floor a couple yrs ago and I welded in a couple corner stiffeners inside the front frame rail - crossmember connection. This changed the "shakey speed" from 25 to 27MPH. So it has some to do with the steel frame oscillation as well. Just gotta remember to hold the McDonalds cup untill it's half empty so it don't splash out of the cup!!!