Amazon.com: Fuperoo Wheel Trolley Assembly,Unistrut Trolley Rollers.Screws can be Installed Inside The Strut Channel.for 1-5/8"strut Channel (6 Wheel Trolley 2pcs) : Industrial & Scientific
Unistrut Trolley System Offers Support to Varying Load Capacities
NEWHOUSE ELECTRIC 1-5/8 in. Strut Channel 4-Wheel Trolley Assembly with Eye Loop, Zinc-Plated Steel, Silver 4WELT-158 - The Home Depot
Amazon.com: UNISTRUT Genuine P2950-EG 4 Wheel Trolley Assembly for use with P1000, P1001, P5000, P5001, P5500, P5501 and All 1-5/8" or Taller Strut Channel : Industrial & Scientific
Andustrial 3-in Square Strut Bracket in the Strut Accessories department at Lowes.com
Unistrut Trolleys
Which UNISTRUT TROLLEY is Right for My Job? - YouTube
P2751-EG 1-1/4 Width x 4-23/32" x 3-1/8", 100 Lb Load Rated, 4-Bearing, Electrogalvanized, Steel, Channel Trolley