Mostly commercial work... buildings with false ceilings and plenty of 2x4, 2x2 & spot luminaires.
Als Antwort auf Bjoern:
RexelUSA has some.
I have Louisville Ladder FE3228 Fiberglass. The biggest advantage of fiberglass ladders is that they are lighter, and hence easier to move around. You can find a review on it on https://mentoolbox.com/the-best-extension-ladders/ . Good ladder no complaints