I used to use the concrete parking bumpers (Shortbed). Three or four of them strecth end to end in the bed and distribute the weigth evenly over the back. About 400 lbs that way.
My dad came up with a weird one in his ranger years ago. 8-12 inch thick chunk of steel about 2 to 2-1/2 feet square. I have no idea what it wieght, but two of us couldn't move it. He use to use a fork lift at work to lift it in and out of the back of his ranger...
I was scared to death what would happen if that thing ever slid forward in that bed. Never did though.
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