Hey Glen, Have someone get inside the vehicle, ignition key ON but not running, have them rock the steering wheel back and forth just slightly and look at the ball joints on all of your steering components. If anything is moving up and down it's bad. Look for slack (delayed response)
Here's a good place to look where people might know a bit more about your specific vehicle:
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Let us know what you figure out. I suspect it's not alignment, but a bad joint. You might want to post all of the specs on your rig. In addition to Year, make, model add engine, 4WD or not and so on.
K.