Well, you can tell it isn't that trucks first rodeo, as someone knew how to "stitch" the tires in the stacking inorder to successfully acquire the overload in this truck; well somewhat successfully anyway.
And when overloaded, the wheel rims flex excessively and the hub caps won't stay on. One reason the trucks most often were equipped with the "Dog-Dish" hub caps even if overloading wasn't counted on, other than just cost considerations.
Scott.