an actuator / coupler device attached to a towed vehicle for releasably coupling the towed vehicle to a towing vehicle , and for actuating brakes on the towed vehicle , wherein the point of coupling is a coupler ball attached to the towing vehicle . in particular , the device comprises a generally rectangular shaped housing for attachment to the towed vehicle , and a generally hollow coupler correspondingly shaped for telescopic attachment to the housing . a roller shaft extends through a hole in the housing and extends through an elongated slot in the coupler thereby providing a point of attachment for the coupler and the housing that allows for limited movement of the coupler relative to the housing . a pair of opposing rollers secure to the roller shaft and are located inside the generally hollow interior of the coupler whereby the rollers roll on a surface within the generally hollow interior of the coupler . a brake actuator secures within the generally hollow interior of the coupler , wherein a first end of the brake actuator is secured to the roller shaft and a second end of the brake actuator is fixed to the coupler , wherein the brake actuator is in operable communication with the brakes of the towed vehicle such that the brake actuator is actuated by movement of the coupler relative to the housing . a coupler ball socket is included within the generally hollow interior of the coupler for releaseable attachment of the coupler ball attached to the towing vehicle .