Hovercrafts with onboard battle tanks. I can't be the only one who thought that was pretty awesome. I kept thinking it'd make a cool voyager or ultra class set where the Hovercraft is a big bot and the tank is like a minion. They weren't small tanks either. There's a whole heap of stuff like that in ROTF that's only glimpsed. Pretty much every vehicle you see you have to wonder if it's a robot in disguise. There were so many things that'd make very cool alt modes.