Second to last place I worked at, we made this particular product. (portable field bin for grain storage etc)
It has doors in the roof which you can't see in the photo.
The top section was what I was interested in. With that section on the ground, it was exactly the right height to house a telescope. At 14' diametre a good size too.
I had thoughts of getting a second hand one & mounting it on a track, but never did. You would'nt want one of these in your back yard Houghy, but thought I'd show you anyway.