Having a broad option on different 2500s, some customers look for any 2500 diesel/gas that is 45k or less with leniency on year. Looks to only filter by model rather than multiple brands. Maybe it still refers them out, but I would hate to put that the customer wants a 2018 Sierra 2500 with 90k miles, when he is open to more brands, years, makes, and only wants diesel.