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I might just have to try this myself!
Hinge it at the front and then use a short wire rope to hold the other end. the sides could be made a bit wider then the tail and just slide past the outside (or into a pocket). this would not work for snow but might be a quick test.
Flexible sides could be made of stiff rubber. They could be made to fold in as the bottom folds up.
Whats the ideal angle for the bottom?
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