I have the 2002 version of the hard boot with the 6 snaps.. IMHO, I am surprised it hasn't flown off the back while on the highway doing 65+ mph.. I look in the side rear view mirrors and i can see the edgers along the side catching air and bobbing up and down.. I sit there and think man, I hope it hangs in there and it does.. All 6 snaps are always secure.. It just looks like air is getting under it and I bet at 80 MPH or some other given velocity, (just guessing) i can see it flying off the rear deck in my rear view mirror.. So far anything under 70 mph It's been somewhat stable but with the flexing on the sides..
I have folded mine as I think they are designed to fold in half.. There is a snap installed to keep it folded.. BUT I think the fold is one of the reasons for the flapping on the sides at highway speeds, i think if it layed completely flat I think it would be taking in less air under the boot as you drove,,
LOL I just thought maybe like a surfboard or a pair of snow skis we need to have a theater installed on it and tied to our ankle or wrist so as we see it in our rear view mirror, lift off and fly off the back of the trunk, we can just haul it back in with the rope.. Nothing but class here!