2017 Dodge Ram Van - Resonates

There is a resonating, harmonic vibration (with associated roaring noise) present at highway speeds in my Ram Promaster City Van.

Roaring noises are often caused by failing wheel bearings. How many miles on your Van? Every had to run it through a water level approaching the wheel hubs?

Differentials with low fluid levela can cause this too, so good idea to check that.