"Tall ladders" refers to long and high stairs or steps used for reaching high places or climbing to reach something positioned above the ground. Full definition
For the next part of this project, you'll see that I had to be on a really tall ladder. (behr.com)
How tall a ladder you build depends on how much money you have, how insulated you want to be from interest rate risk and how much easily available cash you want to have. (assetbuilder.com)