Voidforge Cyclone+Trinity help

Ok I need help understanding how to scale this build. My idea is to run Void-forge with Cyclone/Trinity/Pulverize/Infused channeling/Elemental damage/Fortify. 7+ Frenzy charges and perma onslaught. I would like to also get 50+range to clear through maps with ease. I have a carcass jack to help with that.

Would a slayer be better for that? Both the damage, AOE and being able to tank. And if I were to go slayer how would I gen frenzy charges during boss fights.

Also is the rage support good for voidforge? Not sure how it interacts. Would that be more overall damage then say elemental damage support.

Voidforge takes your weapon damage and adds 300% of it as damage as a random element, so any source of added weapon damage, be it from gear or skills, gets trippled. So yes, Rage support scales well with it but the numbers on it are too small to compete with top end more multi gems.

As for frenzy generation, a rare armor with frenzy on hit is probably the best option.