hey
I've never needed anything of the sort in the sand, and I've spent a LOT of time on the sand, in fact the first day I got my driver's license I went to the beach. I've averaged about 1 day a week at the beach in the last few years. Use a high lift and fill in under your tires to get them level, you'll be fine. Also, I hear strips of scrap carpet work pretty good too, though I've never tried them. A few sections of carpet would weigh a lot less and take up virtually no room. Perhaps I'll have to try it one day.
-Dan