That's true, theatretech, but before this kind of cable, mults were often made of 'elevator hoist' cable. Much heavier, not much better than a hod of 12/3 sjo. If you work for a company doing that kind of work, you probably get to muscle around some lengths of 4/0 type W as well .
Actually 50' bundles of 4 conductor 2/0 all copper cable to power the dimmer rack is heavy enough. I'm not sure which is worse, the 50' of 4 conductor 2/0 feeder cable, or the 100' socapex cable, lol. On some rare jobs we deal with the 100' feeder of 2/0; though usually the 4 conductors (sometimes 5) are separate and not bundled together, which makes it easier to handle 100' of it.
Everything we work with is at least 12 guage; all the AC cable, speaker cables, and the socapex cable. Which is nice to be able to use it to capacity, but when you work on a large gig and have to haul a ton of cable it can be quite a pain!