Dispatched to Grinstead Hill Road for a mobile home fire. Upon arrival, found a mobile home with heavy smoke showing from the A side of the structure. 1.75″ hose advanced to the A side and knocked down the visible fire from the front window. The line was then advanced in to the structure to complete extinguishment. Engine 4’s crew checked for extension under the trailer. There were no injuries reported and the probable cause was an unattended cooking fire.