On the front, I would park the truck close to a tree.Take a hydraulic jack and a couple blocks of wod,use them to straighten the front bumper.
For the rear, I would use a chain and pull it slowly kind of at an angle.Or use a large come-a-long(chain type).

[ 12-17-2001: Message edited by: Mechainiac ]

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!