Model History and Information: A hydraulic detachable gooseneck lowboy is how heavy machinery gets to a job site. The gooseneck disconnects and lowers to the ground under hydraulic power, turning the front of the deck into a ramp so an excavator or a dozer can drive straight on, then lifts and locks again for the road; the whole operation is designed to be done by one person. The TK120 is rated at 120,000 pounds, and its arched adjustable gooseneck gives clearance over the tractor frame with a range of king pin height settings.