If you're planning on transporting a Christmas tree on your roof rack, here are some tips to ensure it stays secure and doesn't blow away in the wind. First, make sure your roof rack is strong enough to support the weight of the tree. Next, use a sturdy rope or bungee cords to tie the tree down tightly. Make sure to secure the tree at the trunk and at the top of the tree, as well as the branches and limbs. Finally, cover the tree with a tarp to protect it from the elements. With these steps, you should be able to transport your tree safely and securely.