Patent ID: 8215657

Claim:
In combination with a tractor trailer rig in which the tractor includes a frame and has at least one rear axle, a dolly; said dolly having a frame, and said frame mounted on an axle supported by wheels; said dolly being selectively fastened to said tractor; a coupling assembly for securing said dolly to said tractor; said coupling assembly having components affixed respectively to said tractor frame and said dolly; said coupling assembly including a transverse locking bar, said locking bar being attached to said tractor frame and disposed at an acute angle relative to the direction of travel of said tractor trailer rig; said coupling assembly further including a plate mounted transverse to the direction of movement of said dolly and secured to the forward end of said dolly; said plate being disposed at an acute angle relative to the direction of travel, said plate including a transverse channel, said channel being sized to receive said locking bar in nesting relation; said dolly including an air bag suspension, said air bag suspension system adapted to raise at least a portion of said frame of said dolly when said air bags are inflated, so as to engage the components of said coupling assembly.