Stafford,
I started with drag chains, and they were a bit of a challenge to string all the wiring through. I have bought them from Amazon and they were NOT the ones with a clip on top, which allows installing the wiring after routing the chains.
I later changed it to the Tape Measure trick which I found easier to install and required less added parts to the build.
I’ve been happy with that solution, but again you need to thread all the wires through at the first.
Mike.