Save on Trolleys! https://unistrutstore.com/trolleys.html
This video shows several different ways to mount Unistrut Trolley Assemblies: Unistrut P1000 (15/8" x 15/8" channel) with Unistrut trolley track hanger supports (P1834 & P1834A), boltthrough mounting utilizing deep profile channels, backtoback style channel mounting. Plus load capacities for the different styles of Unistrut Trolleys!