Abstract: Heavy equipment trailer comprising an elongated deck, a front gooseneck extending from the front of the deck for connection to a pulling vehicle, a rear gooseneck extending from the rear of the deck, a jeep with ground engaging wheels positioned to the rear of the deck, and an elevator operatively connected between the rear gooseneck and the jeep for raising and lowering the rear gooseneck to adjust the height of the deck above the ground. The trailer also has a front jeep and a rear booster with dual axles and multiple wheels, with the loads at the front and rear of the deck being distributed respectively between the front jeep and the pulling vehicle and between the rear jeep and the booster. A front jeep includes a lift for raising and lowering the front gooseneck and the front end of the deck.

Abstract: Trailer with a detachable gooseneck having a deck supported toward the rear by ground engaging wheels, mating surfaces on the gooseneck and the deck which abut against each other when the gooseneck is attached to the deck, coupling pins extending along spaced apart, parallel axes from the gooseneck and the deck on opposite sides of the abutting surfaces, a coupling link movable along the pin on the gooseneck between a first position in which the link engages the pin on the deck and a second position in which the link is disengaged from the pin on the deck, and an actuator for moving the coupling link between the first and second positions. A latch hook is rotatively mounted on the deck to the rear of the abutting surfaces for engagement with a laterally extending latch bar which depends from the gooseneck, and a pneumatic actuator is operatively connected to the latch hook for moving the latch hook into and out of engagement with the latch bar.

Abstract: Trailer with a detachable gooseneck having a deck supported toward the rear by ground engaging wheels, mating surfaces on the gooseneck and the deck which abut against each other when the gooseneck is attached to the deck, coupling pins extending along spaced apart, parallel axes from the gooseneck and the deck on opposite sides of the abutting surfaces, a coupling link movable along the pin on the gooseneck between a first position in which the link engages the pin on the deck and a second position in which the link is disengaged from the pin on the deck, and an actuator for moving the coupling link between the first and second positions. A latch hook is rotatively mounted on the deck to the rear of the abutting surfaces for engagement with a laterally extending latch bar which depends from the gooseneck, and a pneumatic actuator is operatively connected to the latch hook for moving the latch hook into and out of engagement with the latch bar.

Abstract: Heavy equipment trailer and deck extension. The trailer has an elongated main deck with longitudinally extending frame members on opposite sides thereof, and ground engaging wheels toward the rear of the main deck. The extension has longitudinally extending frame members aligned with the frame members of the main deck, and coupling pins extend between the frame members of the main deck and the extension in load supporting relationship, with lock pins preventing longitudinal separation of the main deck and the extension. C-shaped channel members extend along the upper, lower, and outer sides of the extension, past the coupling pins, and along upper, lower, and outer side portions of the frame members of the main deck to hold the frame members in alignment and prevent sagging under load conditions.

Abstract: Heavy equipment trailer and deck extension. The trailer has an elongated main deck with longitudinally extending frame members on opposite sides thereof, and ground engaging wheels toward the rear of the main deck. The extension has longitudinally extending frame members aligned with the frame members of the main deck, and coupling pins extend between the frame members of the main deck and the extension in load supporting relationship, with lock pins preventing longitudinal separation of the main deck and the extension. C-shaped channel members extend along the upper, lower, and outer sides of the extension, past the coupling pins, and along upper, lower, and outer side portions of the frame members of the main deck to hold the frame members in alignment and prevent sagging under load conditions.

Abstract: Heavy equipment trailer having a main deck with a rear gooseneck which is connected to a turntable mounted on a lifting tower carried by a dolly positioned to the rear of the deck. The lifting tower is mounted in a box which is suspended between the side rails of the dolly frame in a manner permitting the box to be shifted longitudinally of the rails to adjust weight distribution between wheel sets at the front and rear of the dolly.

Abstract: Trailer having a main frame with a horizontally extending deck and a pair of longitudinally extending rails spaced a predetermined distance apart for receiving flanged wheels of railroad equipment, and a laterally extensible rear subframe assembly connected to the main frame for movement between different widths for different loads. The subframe assembly has a pair of longitudinally extending rail members which can be aligned with the rails on the main frame to form an extension of those rails.

Abstract: Self-steering trailer having an elongated main frame, the rear end of which is supported by a sub-frame and steering dolly. The dolly is connected to the main frame in such manner that the dolly is automatically turned relative to the main frame in response to lateral movement of the rear end of the main frame to steer the rear of the trailer in accordance with the lateral movement. The steering means comprises an A-frame connected to the dolly, and a steering arm which interconnects the rear of the main frame and the dolly. In some embodiments, a manually controlled actuator is connected between the main frame and the dolly to permit the rear of the trailer to be steered manually.