2017 Chevy Silverado 1500 Bar Side Steps

I bought these for my 2017 Silverado in Aug 2017. They look great and really set off the trucks look, and are perfect for the interim step into the cab front or back. Over the past 34 months they have seen various weather conditions usual for Missouri. I cared for them as any other part of my truck by washing when practical and applying wax at least 3 times a year. The truck is stored indoors when not being driven so the weather exposure is limited. The bars seem durable and made with good quality materials and workmanship. After this winter (30 months on the truck) I noticed that there was finish bubbling on the drivers side bar (nothing similar on passenger side) and the brackets on both sides appeared to have instantly turned from black to a rusty color. At 31 months the bubbling had progressed to multiple locations on the drivers side bar and had popped off exposing sub finish rust. Now at 34 months the bubbling has spread to about 20% of the drivers side bar. I have attempted to repair the rust but it is prolific under the finish and new spots pop up weekly. There is clearly an issue with the drivers side bar finish, but of course the bars are out of warranty. In summary the bars look great, priced right, install easy and are certainly practical. The true negative for me is their service life. My drivers side bar is now beyond repair, so I will be replacing them with something different.