There are lots of fan theories about his true identity. One in particular was that Lord Humungus was actually the police chief a.k.a. Macafee. This makes more sense than him actually being Goose. The reason I am more inclined to go with the idea that Humungus is actually Macafee is this:

1. The majority of the maurraders are rogue MFP. (This includes Roop and Charlie from MM1)
2. We never knew what became of him and we clearly saw that Goose became a "crispy critter" at the hands of Johnny the Boy & Toe-Cutter.
3. Both Macafee and Humungus are bald, muscular, and lead the police officers
4. He seems to briefly recognize Max before using his service revolver to put a bullet into the rig's water radiator

While Humungus was played by a different actor rather than by Roger Ward I do believe they were in fact the same person albiet a different character. I'm also fairly certain one of the hostages was "Benno" from the first film. This of course just my opinion and I could be completely wrong.