Dual Dynamics - Provides trucking products that improve safety or improve maintenance including grease hubs, freight restraints and tire inflation systems. E Tip Inc. - Markets safety, security and maintenance products for the transportation industry. Includes steering controls, locks and preheaters. Normark Industries Inc. - Produces the Luglock wheel nut security ring that protects vehicles against loose wheel nuts and wheel separation accidents. Safety Vision - Provides rear vision and on-board surveillance systems for school bus, trucking, mass transit, and pick up and delivery applications. Inovex Industries - Produces and distributes the Ride-On line of tire sealants that can be used in any pneumatic tire. Wheel-Check - Sells a loose wheel nut indicator that provides a simple, visual means of checking proper wheel torque. Tiss Inc. - Sells alarm systems for trailers to detect illegal intruders and theft. Wip AB. - Supplier of seat leverers, rear vision and surveillance systems. Based in Sweden. Truck Safety Gear - Stocks a variety of safety flags, wide load and oversized load banners.