Hi and welcome,
Its a little difficult to offer any accurate suggestions from the information provided at the moment.
I can say that the back lash in the prop shaft (video 1) looks ok and video 2 is only interesting in the fact you are hitting the rear wheel, is this the location of the noise or vibration in your opinion?
You need to get under the vehicle and check everything, universal joints on the prop shaft, engine and gearbox mounts, wheel bearings, kingpins etc.
You also need to lift each wheel to check for movement and noise when you rotate them.
The tyre looks new, are they balanced and are they a standard size or larger? Only asking as large tyres can touch the bodywork.
Any other information you have please take the time to post, it helps everyone to determine the most likely cause.
Yokohama Geolanders, Sony head unit, NAUTILUS Air Horn, DRL conversion, Rear cargo space, Elvis Bobblehead, transfer Guard, Indian hanging Elephant, Koni Heavy track dampers, Custom SS exhaust, Voodoo Doll, Adventure Rack with LED ight bar, vintage ERIBA caravan usually attached (yes it's slow)
