You called it right, that winged H is Hino. They've been selling trucks in North America for decades now and they're everywhere once you start noticing them. Toyota owns them, and the cabs are basically Toyota quality underneath a work truck body, which is a big part of why fleets like them so much. The one you saw sounds like a Class 6 cabover, which in thier lineup would be something in the 258 or 268 range depending on the year. Those are the standard box truck and flatbed workhorses you see doing local delivery routes all over the place. The smaller 155 and 195 models handle the lighter stuff, and they make bigger conventional-hood trucks too, but the cabover with a colorful wrap on the box is classic medium duty Hino territory. Companies love wrapping those becasue the cab is tall and flat, lots of advertising space. Not rare at all, but I get why they fly under the radar. People expect the badge to say Ford, Chevy, Freightliner, or Isuzu if it's a Japanese-style cabover, so a Hino stands out untill you realize they've quietly been one of the best-selling medium duty brands in the country for years. My old employer ran a couple of 268s with landscape dump bodies and they were dead reliable, nothing but oil changes and brake jobs out of them.
If you want to pin down the exact model next time, look at the side of the cab or the door sticker rather than the grille, since the front badges don't always carry the model number anyway. The GVWR on the sticker will tell you which series it is. But yeah, tell your buddy with confidence, you spotted a Hino.