Generally there are two types of trailers for the delivery of cement and other free flowing dry materials: With compressor for the discharge mounted on the trailer and without compressor.
Trailers with compressor are very difficult to get second hand because they are not common. Normally the compressors are mounted on the truck head and connected by hose pipe to the trailers. The advantage of a trailer with compressor is that you can use any tractor head available for the trailers.
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