DORNIER 328 PROP CONTACTS GND CART WHILE UNDER THE DIRECTION OF A MARSHALLER AT DEN.

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ON MAY/XA/99 AT XA25; OUR ACFT WAS BEING PARKED IN OUR SPOT IN A VERY TIGHT AND CLUTTERED SPACE AT THE DEN ARPT. THE SPACE IS CALLED THE 'HORSESHOE.' ONCE WE CAME IN TO THE 'SHOE' WE HAD TO DEVIATE AWAY FROM THE TAXIING LINE TO AVOID A MAINT TRUCK THAT WAS PARKED AT THE TAIL OF ANOTHER ACFT IN SPOT X. WHEN WE CLRED THE TRUCK AND MOVED INTO SPOT Y UNDER NORMAL MARSHALLER'S DIRECTIONS; I NOTICED OUR GPU ON THE L OF THE LEAD-IN LINE IN ITS NORMAL POS; AND A AIR CONDITIONING UNIT ON THE R IN OUR PARKING AREA. IT DID NOT APPEAR TO BE A FACTOR IN PARKING OUR ACFT SINCE THE MARSHALLER WAS STILL LEADING US IN. THE ACFT UNIT IS NEW EQUIP FOR US AND WE DID NOT KNOW AT THAT TIME IT SHOULD HAVE BEEN PARKED OUT OF THE AIRPLANE'S AREA. WHEN THE AIR CONDITIONING MOVED OUT OF MY VIEW ON THE R; I LOOKED TO THE MARSHALLER FOR ANY ABNORMAL SIGNALS. THE MARSHALLER GAVE A NORMAL HAND SIGNAL TO STOP. SIMULTANEOUSLY AS THE CAPT; THE MARSHALLER STOPPED THE ACFT; THAT IS WHEN THE R PROP HIT THE CORNER OF THE AIR CONDITIONING UNIT. AT THAT POINT THE CAPT SHUT DOWN THE R ENG. WHEN THE PROP WENT INTO FEATHER; THAT IS WHEN IT DID MOST OF THE DAMAGE. WHEN THE PLANE WAS SHUT DOWN AND SECURE; WE STEPPED OUT TO THE NOSE TO SEE IF WE WERE PARKED INCORRECTLY. WE WERE PARKED AS STANDARD ON THE LINE AT THE TOP OF THE 'T.' WAS TOLD THAT THE ACFT PARKED IN THAT SPOT JUST PREVIOUS TO US WAS PARKED 6 FT SHORT OF THE TOP OF THE 'T.' IF WE HAD PAINTED MARKINGS FOR WHERE EQUIP SHOULD BE IN THE PARKING AREA OR A WING WALKER WHEN THERE IS EQUIP.