I use two spring loaded shower curtain rods covered in pipe insulation foam. I then use the metal shower curtain hangers as hooks for #64 rubber bands.

Install the rods cross ways in the bed, set the wing and fuse on the rods, position the hangers one on each side front and back of the wing and fuse, hook the rubber bands to one hanger and stretch over the wing and fuse and hook to the other hanger. Use a single rubber band for both ends of the fuse and two rubber bands tied together for the wing.

Cheap simple and has gotten me there for years. One thing change the rubber bands often the sun will deteriorate them. When I flew band on wings I would fly the bands twice then put them on the bars to keep them rotated.

DEG