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Death Wobble is usually caused by worn steering or suspension parts. If you don't feel comfortable doing the inspection yourself, take it to another alignment shop. They should (as Bounty said) check all the suspension arm bushings, track bar bushings, knuckle king pins (or ball joints), wheel bearings, tie rod ends, drag link, steering box mount bolts and last but not least...lug nuts.
If the alignment was done right then the caster and camber should be correct. If you don't feel it is, have them check it again.

	Track bar A track bar is a component of a car suspension system that provides lateral location of the axle. While the purpose of the rear suspension of an automobile is to allow the wheels to move vertically with respect to the body, it is undesirable to allow them to move forward and backwards, or from side to side. It is this latter movement that the track bar is designed to prevent. It is a simple device, consisting of a rigid bar running sideways in the same plane as the rear axle, connecting one end of the axle to the car body or chassis on the opposite side of the vehicle. The bar is attached on either end with pivots that permit it to swivel upwards and downwards only, so that the axle is, in turn, allowed to move in the vertical plane only.

	Camber Camber angle is the angle made by the wheel of an automobile; specifically, it is the angle between the vertical axis of the wheel and the vertical axis of the vehicle when viewed from the front or rear. If the top of the wheel is further out than the bottom (that is, away from the axle), it is called positive camber; if the bottom of the wheel is further out than the top, it is called negative camber.

	Caster Caster angle is the angular displacement from the vertical axis of the suspension of a steered wheel, measured in the longitudinal direction. It is the angle between the pivot line (in a car - an imaginary line that runs through the center of the upper ball joint to the center of the lower ball joint) and vertical.