Removable flap or extension? Something ingenious involving velcro or press studs?
https://www.lfgss.com/comments/12668472/
I was thinking with more emphasis on removable (every time it needs wheeling through the flat)
Would a conventional flap hold with a nylock wing nut?
Can you not shoulder it?
@MrE started
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https://www.lfgss.com/comments/12668472/