The Battlecharger organization appears in SoD: Magnus.
Rung was introduced in Bullets, a novel by James Roberts, collected in the Last Stand Of The Wreckers TPB.
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I didn't know this (let's say) guy was ever an Autobot. As long as I know Brawl was a Member of the Combaticons (a Decepticons Gestalt team) at the G1 (and my first Transformers toy a zillion of years ago)
In fact, this profile is for his pre-war life: factions did not exist and the Cybertronian Symbol was simply used by Military and High Offices. See our comics in the gallery for details
An Autobot at first? Interesting! Loved this guy in WFC! Always loved charging into a situation, shoot two guys, jump,transform and blast the rest of 'em away with the tank mode!