Final answer:
The priority equipment to get moved upstairs would depend on the specific needs and circumstances. In the given scenario, the 20 stacked mattresses would likely require stairwell support.
Step-by-step explanation:
The priority equipment to get moved upstairs by stairwell support depends on the specific needs and circumstances, but generally, heavy and large equipment that cannot be easily disassembled or moved in parts would require the assistance of stairwell support.
In the given scenario, the 20 mattresses that are stacked on top of each other would likely require stairwell support to be moved upstairs. Mattresses are bulky and can be difficult to maneuver, especially in a staircase.
Additionally, the mention of a ladder to ascend to the top implies that the mattresses are located on a height that may pose safety risks without proper support. Therefore, using stairwell support to move the mattresses would provide stability and ensure a safer transportation process.