Schwing is one of two popular concrete pump manufacturers. The other one is Putzmeister, which seems to be in lead, at least in Halifax. Here a few recent sightings.
Quality Concrete uses this light weight Freightliner for small jobs or in tight spaces, since it stabilizer legs do not have to extend very far.
This Mack can block most of a street, since it takes two transit mixers to keep its pump going.
Macks are by far the most popular chassis for pumpers.