EE FAILED TO PROPERLY SECURE THE RAMP TO THE TRAILER. A PARTIAL SEPARATION FROM THE TRAILER AND RAMP OCCURED. FORKLIFT ""RODE"" RAMP DOWN APPROX. 4' TO THE GROUND. FORKLIFT LANDED ON TIRES. EE WAS WEARING SEATBELT. EE WAS BRUISED, BUT AFTER EXAM. AT LOCAL CLINIC, WAS GIVEN ONE DAY OF RESTRICTED DUTY. HE RETURNED TO FULL DUTY ON HISNEXT SCHEDULED SHIFT.