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The springs on GM vehicles are progressive in design. That means they start to compress more easily at light loads but get stiffer as the load/compression increases. Empty, the truck will never ride like a car, and putting a load on the back puts the truck into the middle of the compression, which smoothes things out. What concerns me is your term 'bottoming out'. This should not happen until the spring is near it's maximum compression. Is it possible a former owner overloaded the suspension and weakened the springs? You might want to do a couple things. First, ask to ride in someone else's truck to see if it's the same. If not, take your truck to a spring shop and have them check it out.
BTW: what is the load rating on your tires, and what pressure are you running in them?
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