couplings for use with clutches for land vehicles; shaft couplings or connectors, and machine elements for land vehicles; couplings for land vehicles; shaft couplings for land vehicles; drive shaft couplings for land vehicles; power transmission couplings for land vehicles; brake segments for land vehicles; brakes for land vehicles; brake systems for land vehicles; tow bars; couplings and transmission components for land vehicles; structural parts for land vehicles; brakes and machine elements for land vehicles; vehicle tow bars; tow bars for vehicles; suspension systems for vehicles; air suspension systems for vehicles; axles for air suspension systems in vehicles; suspension systems for automobiles; suspension springs for vehicles; vehicle suspension springs; suspension apparatus for vehicles and trailers