PC12 ROLLS FORWARD AND STRIKES PARKED FUEL TRUCK WHEN CHOCK IS REMOVED PRIOR TO DEPARTURE.

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WE TAXIED IN UNDER FBO MARSHAL TO A SPOT RIGHT IN FRONT OF THE FBO FACING DOWNHILL. WE PERFORMED THE SHUTDOWN CHKLIST. THE LINEMAN PUT A CHOCK IN FRONT OF THE NOSEWHEEL. WE DEPLANED THE PAX AND RECEIVED A TOP-OFF OF 230 GALS OF JET-A FUEL. AFTER PAYING OUR BILL I; THE CAPT; ASKED THE SIC IF HE WAS READY TO GO. I WALKED TO THE FRONT OF THE ACFT AND REMOVED THE CHOCK. THE ACFT IMMEDIATELY STARTED ROLLING DOWNHILL AND SLIGHTLY R FOLLOWING THE SLOPE OF THE RAMP. I RAN TO THE MAIN CABIN DOOR; OPENED IT; AND CLBED IN THE L SEAT. THE ACFT LURCHED TO A HALT. I LOOKED OUTSIDE TO SEE THAT THE RADOME (WHICH IS ON THE R WING) HAD STRUCK A PARKED FUEL TRUCK. I NOTICED THAT THE PARKING BRAKE HANDLE WAS STILL PULLED SO I RE-PUMPED THE BRAKES TO CHANGE THE HYD FLUID AGAIN AND WONDERED WHY THEY HAD NOT HELD. NO ONE WAS HURT EXCEPT I HIT MY SHIN GOING UP THE STAIRS OF THE ACFT. VERY MINOR. SEVERAL THINGS COULD HAVE BEEN DONE TO PREVENT THIS. SINCE WE NORMALLY OPERATE WITH 2 PLTS; ONE OF US COULD HAVE HAD THE BRAKES AT THE CTLS BEFORE THE OTHER PULLED THE CHOCK. WE COULD HAVE ASKED IF A LINEMAN WAS AVAILABLE TO PULL IT FOR US. PERHAPS HAVING ANOTHER CHOCK ON THE MAIN WHEELS WOULD HAVE ALLOWED US TO NOTICE SOMETHING WAS WRONG BEFORE A RUNAWAY OCCURRED. FINALLY; THE FBO COULD STOP USING THIS SPOT AS LONG AS THERE ARE OTHER LEVEL PLACES AVAILABLE (SPACE IS LIMITED HERE BUT THERE ARE SEVERAL LEVEL SPOTS AVAILABLE USUALLY) IF OPERATING SINGLE PLT; WITH NO ONE TO ASSIST; CHK THE PARKING BRAKE AND THEN REMOVE THE CHOCK WITH CARE.