I have always had a Thule box on my Xterra during the winter months. Love it but I am going to try traditional "clamping" racks this winter. Do any of you have experience with traditional clamping racks from Thule or Yakima? I need to be able to hold 4 snowboards on top of my Xterra and the racks must be able to lock. Any info or feedback would be awesome. Thank you.