If you have unlocked and loosened your SpeedKnob and the rack will not come out of the receiver try the following;
1) Loosen SpeedKnob all the way - This will likely drive the knob outward away from the tongue leaving a gap between the knob and the tongue
2) Use a mallet or the base of your hand to tap on the face of the SpeedKnob. This will push the wedge back, resulting in the knob sliding in toward the tongue which will loosen the wedge at the end of the SpeedKnob shaft thus freeing the rack
If you have further questions please contact us here, or by phone at 888-925-4621 during business hours.