Quoted from flipnout1:This is my usual answer. If you are using a hand truck to move a pin now you can use an Escalera.
But here are the dimensions of an Escalera. The toe plate is 24 inches wide. The distance from the back of the wheel to the front part of the frame that a game would be resting against is about 7 inches. So add the 7 inches to the dimension of a folded up pin and that will tell you if it will fit. The door obviously to the stairway would be open so you only need to get the Escalera on to the landing and you can start the turn. Or you may have to set it down and spin it on something so as to not scratch the floor.
Widebody pins would probably not make any difference as the head of any pin in the widest part, not the body. The head is about 27-29 inches depending on manufacturer so they can fit through any exterior doorway.
Thanks. I guess part of the problem is that I don't know if I could move them in that space with a regular hand truck. Right now, I carry stuff around the side of the yard to the basement. However, it is challenging in that there is a significant elevation gain and a handful of stepping stones, which act like stair steps to take up the steepest part of the slope. Then once I get to ground level, I have lots of plants and posts and rocks to navigate. God help me if I should step on a plant. It seems like it would be a whole lot simpler if I could use the stairs. Maybe someone else has experience navigating stairs with this limitation?