I have a Nissan Titan and I was told that my bike can be tied down diagonal. I was told to put the front tire in the left hand corner and the rear tire in the right hand corner. The tie downs would go from the handle bars to the left rear and the right front tie down hooks in my bed. The problem is when I tried this the front tire came away from the front corner so the bike could roll forward and back. This did not seem very safe so I didn't haul it this way but I would like to if it will work. Am I doing something wrong? I did not have the tailgate up when I tried this because I still needed to load some of my stuff. Does the tailgate need to be up when I tighten it down? If the tailgate needs to be up wouldn't this defeat the purpose of being able to load my gear in and close the tailgate? I would have to load my bike and then lift my ramp and all of my other things over the closed tailgate. Help?