disclosed is a device to mount an accessory to a vehicle wherein the accery can be moved between a deployed position or a retracted position . the device has a mounting bracket removably fixed to the vehicle and has cylinders fixed to the mounting bracket . the device also has shafts translatably received in the cylinders , an accessory bracket fixed to the shafts , and a shield bracket on one of the shafts between the mounting bracket and the accessory bracket . the device has a lane marker dispenser or other accessory pivoted on the accessory bracket about the same axis as a shield pivots on the shield bracket . the shield and its bracket are translatable toward or away from the accessory bracket on this axis . the device additionally has structure for locking the shield to the accessory after the shield is translated toward the accessory .