The mighty Tankor is a Vehicon general that reports directly to Megatron, and leads legions of near-mindless tank drones into battle. As his name suggests, he turns into a treaded tank of Cybertronian design, and carries a lot of those burly, armored, well-armed traits into his robot mode. The Beast Machines animated series would reveal that Tankor started life as one of the Maximal heroes from Beast Wars, but that's not a trait shared by all versions of this character's history across various continuities. He was available in 2000.
The combined form of the Universe Micromaster Aerialbots is Superion, an amalgamation of six robots plus their pack-in accessories that serve as connectors, head, and extremities of the gestalt warrior. While in Japan, the original source of the design ( Sixwing , 1992) was available in a collected set, this combiner needed to be purchased one bot at a time in the 2007 Universe release.