SLIDING BOGIE LINK TRAILER WITH STEER AXLE

A sliding bogie link trailer (1) has a front trailer part (2) and an associated rear trailer part (3) which are slidably interconnected. The rear trailer part (3) forms a sliding bogie which is slidably mounted at a rear end of the front trailer part (2). The front trailer part (2) has a kingpin (5) for connection to a fifth wheel of a tractor vehicle for towing the trailer (1). The rear trailer part (3) has a pair of longitudinally spaced-apart steer axles (6, 7), each carrying a pair of ground-engaging road wheels (8). A steering system on the trailer (1) is operable to steer the wheels (8) on each axle (6, 7). Sensing means (10) is provided on the trailer (1) to sense when the rear trailer part (3) is in a fully open position on the front trailer part (2). The steering system is operable to lock the wheels (8) at a zero steer angle when the rear trailer part (3) is not in the fully open position. A fifth wheel (11) is mounted at a rear end of the rear trailer part (3) for towing another trailer behind the sliding bogie link trailer (1).