My wife and I are planning a little road trip. The last one we went on, it was just us and we had plenty of room for our luggage. This time we are bringing some friends along and need the extra cargo space. I am looking for a cargo box to clip onto my cargo rails that came factory installed. The local dealership didn't have any and spending $500 online without knowing that it will fit is hard to do. Does anyone have a cargo box or recommend one that fits snuggly?