6 Wheel T Type Trolley Assembly Electric Hoist Easy Installation Roller Trolley Silent for use with 1-5/8" Wide and All 1-5/8" or Taller Strut Channel-1PACK: Amazon.com: Industrial & Scientific
Amazon.com: 4 Wheel T Trolley Assembly Electric Hoist Easy Installation Roller Trolley Silent, Four Bearing Roller Strut Channel Trolley Hardware for use with 1-5/8" Wide and All 1-5/8" or Taller Strut Channel :
10,000 lbs Electric Chain Hoist with Electric Trolley
Amazon.com: OrangeA 2 Ton Heavy Duty Manual Capacity Plain 4000LBS Push Track Roller Trolley Crane Lift Dual Wheels Garage Hoist for Straight Curved I Beam, 2T (Manual Trolley 2 Ton) : Automotive