Hey Daniel quick question. What are you using to secure multiple tanks in the back of your X? Do you have a makeshift carrier in place? I used those bungee straps to secure a full tank of propane the other day, was surprised that they held it in place...even when I was driving like a maniac into some bends! I've got four tanks filled sitting in my garage ready for transport on Tuesday. Getting in a practice dive before Cozumel on the 20th. Any suggestions? Right now I jam some towels, weights, and bags back there to restrict movement.