Trailer pulling. I guy I work with used to have a 78 suburban from new, and used it to pull his 66 Chevelle race car. He had the rear end replace 3 times. But I guess that's what you will get using a halfton to do a 3/4 ton's work.
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http://hometown.aol.com/racedvl/racedvl69index.html
Crystal Lake IL. 30 Miles north of Chicago