Amazon.com: HOTYELL Trolley Assembly, Silent Rollers Wheel for 1-3/4" Wide and 2-1/4" or Taller Rail Hanging Track, Beam Trolley Used for Heavy Barn or Shed Sliding Doors : Tools & Home Improvement
OZ LIFTING PRODUCTS, Push, 2,000 lb Max Hoist Load Capacity, Push Beam Trolley - 61KH39|OZSS1PBT - Grainger
Beam Trolley / 3″ – 10″
Grey Hub - Top Quality Crane Wheels for The Material Handling Industry