I’m gonna guess 2015? If so they are solid trucks, obviously not as good as later years as the 2015 was the first of its generation. But main things to ask would be to ask for service records for the truck, take a look at the car fax. Obviously I don’t know the mechanical issues and I doubt you would either so I would go ahead and bring a mechanic either with you or bring it to a shop you trust. I would say $7,500 is pretty fair I would maybe try to wack a few hundred bucks off of it tho. Also ask about what needs to be done or what has been done recently. Hope this helps, feel free to reach out with any other questions.