I have a 2012 3500 that I had in for service a couple of months ago and at that time the dealer said I had a front shock leaking. Didn't have it in stock but would order one in. Went back in today and still on backorder. This seems strange that shocks are this difficult to get. Glad I'm not needing a part that is critical to driving it. Has anyone else run into items that are on National Backorder?