I found that the small tube will only take about 5 feet of hose compressed, so I fitted a length of plastic underground sewer pipe between the fuel tank and the air bags. It just about fits with approximately 2-3 inches spare between the tank and the air bags.
It is "hinged at one end with a threaded rod through the end of the tube to act as a stop and a fixed but hinged end. The other end just pops on a small vertical rod riveted to a stainless strap on the side skirt. It works very well. The full length hose is outside, the air gets around and through it and it is secure.
The photos tell all, I hope.