From the submitter:
So, this guy figured out that if one ladders equals one level 3 of them will get them right to the 3rd floor, quite intersting solution.
But at least those clamps are lending their support. ~NSHA
This should have been the only trap set in Home Alone 4, with the rest of the movie a thrilling court drama about whether or not to try the boy as an adult for manslaughter.