DESCRIPTION 1977 Tramco NH3 Transport Trailer (JN0252, Unit 19071), 1977 Trinity 10,500 gallon NH3 tank, Blackmer pump, Shell THK. .400", Head THK. .250", length 38 - 10 1/2, National Board #111623, S/N 416126 tandem axle, spring suspension, 11R22.5 tires. Notes: This trailer has frame issues and thin spots in tank.