Abstract: An adjustable load stabilizer secures loads of any size within the width of the track carried in a cargo bed of a truck or SUV and which extend beyond the vehicle tailgate, while not interfering with the operation of the tailgate or cargo bed when permanently installed. The load stabilizer comprises two brackets which are mounted to the vehicle tailgate and which support a traversing track which is offset from the tailgate by 3 inches, mounted parallel to and lower than the top of the tailgate. Two travelling arm carriers move freely along the length of the traversing track, each supporting a collapsible arm. The travelling arm carriers are moved into position to stabilize the extended load and the collapsible arms are then raised. Raising the collapsible arms creates an interference fit with the traversing track thus securing the arms in the upright position. The arms thus prevent the extended load from sliding around the cargo bed during transport.