Originally Posted by Raiden
I think you left out a combiner robot which had 15 vehicles combing to form one gigantic robot (I forgot the name). What's striking about this combiner is that those 15 can form into 3 teams of 5, one for air, another for land, and last one for sea. Each team is also a mini combiner team, because the 5 vehicles can combine to become an unique vehicle, although none of the vehicles can become a robot, only when all 15 combine at once. I own the toy when I was young and I had fond memories of it.
You're thinking of Dairugger XV, also known as Vehicle Voltron in the US. I do mention him briefly at the beginning of chapter V above, with a link to the YouTube video of the opening titles.
However, you do raise a point -- I'm not attempting to cover EVERY Japanese robot, whether combiner or transformer. There's just too many of them. I'm just trying to point out a few of the more noteworthy ones. Dairugger is kind of noteworthy, since he set the record for most vehicles making up one robot.