Werner Extension Ladder 1A Rung Plug
thingiverse
This plugs up the ends of the ladder rungs of the Werner Type 1A (300 lbs) 28' Extension ladder on top of my truck so it stops whistling. It might fit a different ladder. I think other lengths of Type 1A extensions by Werner are probably a very good chance. Other ratings and other manufacturers probably a much lower chance of them fitting. The plugs as printed on my printer are a snug friction fit but I doubt they'd stay in place at highway speeds so I installed with a bit of acrylic caulk to hold them in place. Your tolerances might be different and require scaling.
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