Our kids rode in the old Dreamer camoer in the early 70s to 80s from Oklahoma to Oregon and back and lots of places in between without incident. We had the pass through window and doughnut for them. No crew cab then. But then seat belts weren't all that common nor required then either in truck or camper. The Good Lord must have liked us or just didn't want any of us yet. Today I wouldn't do it as I'm older and seen too many disasters to be comfortable with it even if people didn't stick their noses in your business as is so common nowadays.