That is why I use rubberbands. I check and change them often. The sun's UV seems to get at the bands. When I flew planes with rubber banded wings I would use the band on the plane a couple times and then put them on the bars. Now I keep a box of bands in the truck and change them once a week or so or if they get a nick or show signs deterioration

If one of the rubberbands break I have the fuse and wing held at two places so hopefully I will have some get to the berm time.

The shower bars are wider than the lip on the top of the bed so if one comes loose it still won't come out. I have had them work loose and the one end will just slip down in the bed against the double deck steps. Never have I seen them try to lift out.

I think that by raising the planes off the floor the air comes over the cab and pushes down on the planes, whereas if you set them on the floor the air comes over the cab into the bed at the wheel wells and will try to blow the plane out over the tailgate.

Just my .02

DEG