I think you're very close. Ryan's gaylord is right at 35 cubic feet divided into 450 lbs = approximately 12.8 lbs / cu ft. Your 8 fot bed 5 feet wide and 20 inches tall (lets go 18 to be easier and make up for the wheel wells) is 60 cubic feet. 60 x 12.8= 768 lbs $2000 divided by 768 lbs is $2.60 per lb price you need to reach your goal.
I had a box this week of motherboards that I packed tight and ended up with 56 lbs in a 2.5 cubic ft box for a 22.4 lb/cubic foot. Your truck would hold 60x22.4= 1344 lbs if you got them that tight. That would be hard to do in a truck bed, but with stacking you should hit somewhere between those figures.
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