The round safety feet are the buisness also you can replace the rubber suction pads when they wear out.
Perfect solution for wet concrete and they do not sink into manicured lawns!
I personally only use ladders up to first floor anything above is either done from inside or with w.f.p.
I remember slipping ladders,a 3 section aswell,and thought never again.
Sold the 3 section and never looked back.
Jelly legs last an hour but a broken back takes longer to heal.