Dust plate/ cover???
www.kleenwheels.com I don't know how well they work though, and they seem kinda expensive to me. If ya decide to get them let me know how they work out for ya.
One possible problem with dust shields is heat build up. Heavy vehicles generate lots of heat in braking. A shield can sometimes disrupt the air flow, which causes brake fade and warped rotors. Sometimes it is just worth it to clean your wheels more often.


