We use unistrut all the time to mount barcos. If the drop from the ceiling to the CRT is less than 12" we use 3/8" threaded rod, which means 3/8" captive nuts, which means the smaller unistrut. If you want to go with 1/2" threaded rod, then you have to go with the deeper unistrut as the 1/2" captive nuts won't fit in the shallow unistrut.
So here is what I do if I have ceiling joists I can lag into:
Lag unistrut into 3 ceiling joists to spread the load w. 3/8" x 3" lag bolts.
I use the mounting tabs on the barco for and aft and they alreaddy have holes drilled. So the line up from the unistrut down is 3/8" captive nut w/ 3/8" threaded rod in it, washer and nut to loc the threaded rod into the captive nut, and then a washer and nut on each side of the barco mounting tabs.
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