[77newell]

You seem to have the most extreme case of rivering I've ever seen on steer tires. Overloaded tires will experience both overheating and rippling of the outside edge of the tires. High speed will make this worse. Once the rippling gets established in the wear pattern it becomes a self sustaining pattern that progressively worsens. Steer tires are highly prone to rivering (rippling on the outer edges) and that has lead to the development of steer tires with a unique tire edge design.

The solution is properly rated tires, properly inflated for the load, plus at higher speeds many makers require even higher pressure by 10psi or so.