At the risk of further blowing your mind, I must also point out that the ladders actually remain extended for a set period of time, which is somewhere between 4 to 5 in-game timer seconds on the level 5+ timer. At the beginning of every pie factory (again, level 5+), the right ladder retracts almost immediately, while the left ladder remains extended until the 7200 mark. If the ladders extended immediately after fully retracting it would be possible to fully know their sequencing. However, as we all know, the time ladders remain retracted is random, and thus their overall sequencing is random. But yes, from the moment each ladder fully extends, it will remain extended for 4-5 timer seconds every time.
Hopefully this information will save a life or two.