Countryside Tank Company. Countryside Tank manufactures MC-331 LPG and NH3 transport trailers at our production facility in Osceola, Iowa. We take immense pride in every transport we build, because we understand the long-term investment our customers make when purchasing equipment. We do not cut corners on quality; our transports are built for a lifetime of safe and reliable use. Additionally, we back what we build, which means we will be there to help for years to come. Call Kate Patton 6413422134.