I just picked up my carbonized gray Platinum F350 6.7L Tremor this past weekend. The whole family flew out Colorado and drove it back to Seattle! I absolutely love this truck! I've order a RetraxPro tonneau cover for it that should be shipping soon. I want to get the bed sprayed first as my truck didn't come with it from the factory. This is my first truck and I'm trying to figure out my options? Line-X or Rhino Liner? Over rail or under rail? Different types of coatings? What does everyone recommend?