John Dsuban Spring Service sells and installs Centramatic Balancers.
Patented Centramatic Balancers are a unique line of "On Board" Balancing Systems for tires and wheels that maximize tire life and smooth your ride. Mounted behind the wheel they offer permanent solutions for balancing assemblies. Centramatic Balancers operate automatically and can adjust instantly for changing conditions.

Centramatics are available for Trucks, Tractor/Semi Trailers, Coaches, Buses, Delivery Vehicles, Motor homes, Trailers, Large Pickups, Jeeps and Police Cars. We even custom build for applicationspecific centrifuges.
http://www.dsuban.com