Tom/Barb wrote:
They flutter and make noises.
Birds flutter and make noises, too. You wouldn't discount them.
Ratchet straps used for camper Tiedowns are an alternative. Like what has been mentioned, stretching is a minor problem. To me, adding an inline spring of some sort would improve the non flexibility of a rigid ratchet strap setup.
I like the "outside of the box" thinking Mr Sidecar. $289 for four sounds much better than the same number for two. Design a spring system along with the ratchet straps and you will have a very unique system. You might even look into a patent, make tons of cash, and take me on a northern Michigan camping adventure.
Good luck. Keep us posted.
Lakeside