Or axle steer - as the axle moves up and down it also is moved side to side due to the arc "scribed" by the trackbar. It becomes more noticeable as the ride height is increased. Nature of the Beast and unless it is actually yanking it from you grip - pretty much is what it is. If you notice - even on a stock control arm/trackbar the nose makes a little circular movement as you go over a speed hump - raising makes the circle a bit bigger and more pronounced unless you also raise the track bar mount or use an adjustable track bar to lengthen the link.
J Wm Bishop EA, ASADE
The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a hard knock...