Alright, here is another Mud & truck maintenance post. Look at the tires in the video immediately under the wheel hubs.
— Trent Telenko (@TrentTelenko) March 4, 2022
That is oil from the wheel hubs leaking onto those tires from the hub to the ground.
The seals on those wheel hubs have failed due to dry rot.
1/2 https://t.co/J4MKLsA1tA