Abstract: A jack carried by the draft tongue or A-frame of a trailer supports the front of the trailer during the coupling thereof to the hitch member of a towing vehicle and the jack is also utilized to tension the load transfer members which equalize the load on the wheels of the towing vehicle. Following the coupling and tensioning operations, a retractable engaging member on the jack is connected with a rigid load bearing member on a solid portion of the trailer A-frame which relieves the jack of heavy forces generated by or transmitted through the load transferring members during towing. Safety, convenience, and stability during trailer transport are enhanced by the invention.