Characteristics for an American medium landing ship (LSM) in March 1961

Dimensions 204 x 85 x 7 feet. Speed 12 (cruising)-13 (maximum) knots. Troop capacity 54 Cargo capacity 165 (beaching)-400 (at sea) long tons. Range 4,900 mils/12 knots. Largest equipment carried 5 medium tanks or 6 LVT or 9 DUKW.  

Source

Army forces in amphibious operations (the Army Landing Force). Department of the Army Field Manual FM 31-12. March 1961.