12 axels for vehicles, namely trucks, trailers, and semi-trailers; slack adjusters; steel and aluminum wheels for truck, trailer and semi-trailer tires; landing gears for trucks, trailers, and semi-trailers; shock absorbers for trucks; shock absorbers for trailers; shock absorbers for semi-trailers; suspensions for trucks, trailers, and semi-trailers; suspension systems for trucks, trailers, and semi-trailers; air springs