I have one of these:
https://www.amazon.com/Werner-MT-13-.../dp/B0000VYDHA
It stores vertically in even the smallest van , but extends to cover 95% of my ladder needs. Much easier than putting one on the roof (lifting and strapping down) and in my case I don't need roof racks at all (since I can fit an 8' ladder inside on days when I might need one). In it's shortest mode the footprint is small so handy in tight spaces like bathrooms and kitchens - so no need for a dedicated 3' ladder either.
One of the best things I've ever bought. The only downside is that when extended only the middle rungs are broad, which can get tiresome on your feet if you're on it all day.