I'm not sure if this is suspension or tire related so here goes...

I have Toyo Open Country MT 35x12.5R20's on a what I think is 4" suspension lift. I bought it like this so not positive what has been done suspension wise.

On the highway I have some pretty strong vibrations to where the empty seats shake, I see the hood shaking and my kid goes "whoaaaaaaaaa" so he can hear his voice vibrate LOL. I'm not sure if it's related to the tires, the rotation/alignment needs, actual suspension, etc. If anyone has some feedback to help me steer(no pun intended) in the right direction, I'd appreciate it!.) I attached a video showing the shaking of a water bottle since that's the only stationary object in relation to my vibrating arm.



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