Trailer with multiple-bin material mixer and spreader

A mobile trailer for spreading a salt and sand mixture, said trailer comprising:

• two containers, one said container for containing salt, the other said container for containing sand, each said container comprising a respective material-exit opening;
• a movement-imparting assembly comprising a respective movement-imparting device mounted to each said container so as to move the salt and sand respectively contained therein through said respective material exit-opening;
• and
• a material mixer and spreader assembly positioned near each said material-exit opening for receiving, mixing and spreading the salt and sand;
• wherein said movement-imparting assembly selectively and independently modulates the speed of each said movement-imparting device thereby modulating the ratio of the salt and sand received, mixed and spread by said material mixer and spreader assembly.

An apparatus for spreading a granular material mixture, said vehicle comprising:

• a vehicle;
• and
• a trailer coupled to said vehicle, said trailer comprising:
• at least two containers for containing a respective granular material, each said container comprising a respective material-exit opening;
• a movement-imparting assembly comprising a respective movement-imparting device mounted to each said container so as to move the respective granular material contained therein through said respective material exit-opening;
• and
• a material mixer and spreader assembly positioned near each said material-exit opening for receiving, mixing and spreading the granular materials;
• wherein said movement-imparting assembly selectively and independently modulates the speed of each said movement-imparting device thereby modulating the ratio of each granular material received, mixed and spread by said material mixer and spreader assembly.