A fuel tank trailer has a fuel tank supported on the bed of the trailer, and a secondary containment wall surrounding the fuel tank to provide an open secondary containment region. A first clearance suitable for the recording sheet having a standard thickness and material, and a second clearance greater than the first clearance, can be selected. The components within the wireless communications network communicate using messages which have a control field and at least one information field. A ring assembly is placed about the elongated linear member, and is free to move up and down along the elongated linear member. A method for placing the stent and foil into a vessel of a body is also described.