Plain old 2x6 cut just like in Titan's pic. If your truck box has slots, spend 4 minutes cutting it nicely. If not, just cut it so that it leans against the wheel well, then throw 3-5 sand bags behind it, parallel to the motion of the truck. The front of the bags will press against the 2x6, and the backs will hit the tailgate. For good measure, go wash your truck, and the bags will solidify and freeze in place afterwards.
Keep a few tools in your truck, and if you ever need sand to help someone that isn't as prepared as you, you can cut bags open. The middles of the bags will still be loose sand. Actually this last part I only had to do once, and that was one year that I actually found gravel bags. Worked great. I cannot personally vouch for the effectiveness of sand.
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