If you are looking for a camera dolly guide, "22" often refers to the track width or a specific model version.

: These parts are often part of a larger "Dolly Kit" (such as Kit 22) used for maintaining pump head rings or plunger seals. 2. Heavy Transport & Trailer Equipment

: While "Dolly 22" isn't a standard model name like the Chapman or Fisher dollies, 1980s filmmaking relied heavily on wheeled carts for smooth horizontal movements.

: Modern versions like the TAD 22 are designed for two-axle semi-trailers, but they follow the mechanical principles established by older 1980s-era transport dollies. 3. Film & Production Equipment