: 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
In the 1980s and early trailers, "dolly" refers to the unpowered vehicle used to support a semi-trailer. Dolly 22 (1980s) PDF
The most specific reference to "Dolly 22" in technical documentation relates to spare parts for high-pressure washers and pumps. : Modern versions like the TAD 22 are
If you are looking for a camera dolly guide, "22" often refers to the track width or a specific model version. Dolly 22 (1980s) PDF
: 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