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An unladen p/u has a very heavy front weight bias. This causes an inherent understeer(the front end sticks better than the rear). When the steering wheel is turned the natural tendancy will be to continue going straight. If you had a full load in the back the reverse would be true, inherent oversteer(the back has less grip than the front and will want to swap ends)
Weight in the back does 2 things
1) reduces inherent understeer
2) increases polar moment which causes thing to happen more slowly, any handling issues are easier to catch.
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