Can someone tell me if the spring on the pull down awning is in the arm or in the roll up head of the awning. I need more tension on the awning to hold it in place while driving. When a big rig goes by it pulls the awning out and then it slams back in place. If I don't strap it down before I hit the road I have to stop and put a tie strap on it to keep it in place. Thanks for the help.