Ours are coming up on 5 years old now. Just took them out yesterday to purge the old grease out of the hubs. They are Al KOs and they all looked like brand new.
Your's almost look like they have been exposed to the elements? Do you not have any center caps in your wheels?
Either that or they simply had a bad batch of material come through.
1999 Ford Superduty F250 PSD CC SB 6spd 4x4.
B&W goosneck/companion hitch, Airlift 5000 airbags.
2006 Sierra F28 Rear Kitchen 5th Wheel, 31' = 10k pounds.
Nights camped in 09-14, 2010-23