Now a new, better concept in auxiliary fuel systems: The TITAN Travel Trekker is made of our famous military grade, cross-linked polymer--- tougher than steel and longer lasting than aluminum. Its durability is legendary. We routinely test our tanks using state-of-the-art computer simulations as well as physical drop tests. We fill our tanks completely and drop them 30 feet onto a steel plate--- never losing a drop of liquid. They are so tough and well-proven that we back them with a Lifetime Warranty.