How many here use sand bags for weight in their car or truck in the winter? For fifteen years I have been using bags of small stucco chips instead. They are cheaper than the dirty sandbags sold around here. 50 pound bag of stucco chips is $3.50 They don't mess up your vehicle even if they spill. Nice clean white rocks easy to clean up. They don't freeze into a solid lump. They don't get your hands all filthy if you need to throw some under the tires for traction. And they REALLY provide traction, way better than the dirty frozen sand.
Best of all in spring you can use them for landscaping in your yard.
So why after fifteen years of harping on this am I the only one using them.<g>