I’m assuming this rig is front wheel drive. Could be cv joints like vc mentioned above. Usually they will “click” or pop, though rather than make a growling bearing noise. May be that they “growl” like a bearing in early stages of failure and I’ve never noticed it, though. Could be bearing noise inside the differential/transmission. Make sure the trans is full of lube, make sure the cv joints aren’t slinging grease from torn boots. If the wheel bearings check out, cv joints don’t have play or torn boots, and the trans is full of the proper lube…I don’t know what else I’d do besides wait for the problem to prevent itself more clearly…
The video, the sound just comes across as road noise / background noise. I can’t tell a lot from the video. I’m sure it’s different in person.