Firetruck aerial ladders.
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Previously:
https://www.homemadetools.net/forum/...061#post207338
https://www.homemadetools.net/forum/...058#post184194
https://www.homemadetools.net/forum/...861#post167675
https://www.homemadetools.net/forum/...714#post206132
https://www.homemadetools.net/forum/...107#post203351