I have the rubber spill mat as well. I read somewhere that the bottom was rubber, so shouldn't be too bad. Amazon says it is non-slip material. Worst case is I can bungie cord it into place.
I have actually tried calling a few times and have not had them switch. Not going to bother for this one as I only save a few dollars anyway. $53 + $15 vs. $39 + $37
The nice thing about this unit is it is a solid one piece bottom, so should give it some good stability.
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