I find that using the black ribbed commercial hall mat cut to size works best, unless you're putting large amounts of snow (sand for me) covered items on the load floor all the time.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course