EE STOPPED AT J.F.&H. EQ SERVICES IN FT. SMITH AR. TO PICK UP A COMMERICAL WELDER MOUNTED TO A RUBBER TIRED TOW TRAILER THAT MID AMERCIAN HAD PURCHASED FROM J.F. & H. WHEN EE ATTEMPTED TO LIFT THE TONGUE OF THE TRAILER UP TO HITCH IT TO THECOM. TRUCK, HE FELT SHARP PAIN IN THE LOWER PART OF HIS BACK.