The best thing i can think of is what we used to do. Wet the truck bed with cold water, and then take a burlap tarp and soak it then lay it on the bed then place the sacks on it spaced out the best way you can. Then take another burlap tarp and soak it down and place it on top of them. Now this was only driving 100 miles or so, but make sure to wet the sacks as often as you can. I hope this helps
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