What is the proper method for securing loose bulk cargo (such as sand, gravel, or soil) in an open-top dump truck?

1. Level the load below the sideboards and cover completely with a securely fastened tarpaulin (tarp)
2. Pile the aggregate as high as possible in a pyramid shape without covering
3. Wet the surface with water so wind cannot blow particles away
4. Drive faster so aggregate settles into the truck bed