FHT Type Full-Automatic Hydraulic Carriage The FHT is a rigid-constructed high speed carriage provided with a base-mounted feed mechanism. From a wide variety of versions with different headblock openings of 800-1500mm, you can choose the best type of carriage to suit the wood species and diameter of logs. FHTS Type Full-Automatic Hydraulic Carriage The FHTS is a carriage equipped with a carriage-mounted feed mechanism which can be controlled by the operator riding on the carriage.