I maintain a fleet of several rear-wheel-drive cargo vans, and in winter we use sandbags for ballast over the rear axle.

Here’s the problem... sandbags are filled with gravel, and over time they generate a large amount of dust which then fouls up the cargo areas. Does anyone know of a good substitute for sandbags, or something that wouldn’t generate as much of a mess? I’m really getting tired of cleaning these things.