I was able to find the international Ranger manual, here on page 170, which appears to be from 2014. It lists the same 62 mph speed limitation. Maybe that's an international requirement and just made it over to the manual here. However, it states to reduce the gross train weight by 10% for...
Below are excerpts from the 2019 Ranger manual:
Page 208: Do not exceed 62 mph (100 km/h) even if a country allows higher speeds under certain conditions.
I’ve been unable to find a limitation like this for another vehicle. For example, the F150, Escape, and Explorer manuals only state to not...