The RX4 Patrol Ship which can be found anywhere in Trianii Space, and is the standard patrol craft of the Trianii Rangers. This model was in service before the Battle of Yavin. Designed for incredibly long duration patrols and the fact that Trianii Rangers often labour together in small family units, RX4s are equipped with more lavish living and recreation quarters than is usual for military ships. These four engine craft are more than sufficient to handle small-time smugglers and pirates who prowl the space lanes among seven worlds of the Trianii. In cases where craft larger than a smuggling freighter are encountered, the RX4 seldom engages them in combat. Durable and able to absorb considerable punishment, when outmatched, its ion cannon is usually sufficient to disable its opposition, thereby allowing the RX4 to withdraw into hyperspace.

    The New Republic had acquired a RX4 at least three months after Grand Admiral Thrawn's untimely death in order to carry out their search for "The Relic". Its sensors are able to detect nanoscopic sized particles, though they may not be able to determine their composition. However, the sensors can collect enough scientific data about them that can keep Intelligence analysts busy for several weeks.