Uprights
Tall, narrow front to back, and top-heavy.
Handling
Travels on its castors onto a piano board or skates, strapped upright, quilted at the corners and across the casework. The top-heaviness is the whole risk — an upright that starts to tip does not stop, which is why nobody stands downhill of one.
On stairs
Goes down stairs on a board with the weight held from above, never carried. A standard straight flight is routine. A turn with a low ceiling is where the assessment earns its keep.