PA28 PLT HIT ANOTHER ACFT DURING TAXI IN.

Narrative

I HAD FINISHED CLOSED PATTERN WORK AND CONTACTED TWR TO TERMINATE AND TAXI TO PARKING. CLRNC WAS GIVEN AND I WAS TOLD TO MONITOR THE GND FREQ. I CHANGED FREQS AND PROCEEDED ON PARALLEL TXWY AND TURNED ON TXWY D. 2 FUEL TRUCKS WERE ON THE TXWY BLOCKING THE R-HAND 1/3 OF THE TXWY. I APCHED; SLOWED; AND CAME TO A STOP. I HAD DRIFTED OFF CTRLINE A BIT; BUT WAS IN A SAFE AND CLR POS AND STOPPED. AN INDIVIDUAL WITH A RADIO CAME FORWARD FROM BTWN THE FUELING TRUCKS AND MOTIONED ME FORWARD. HE WAS TO THE FRONT AND R OF MY PLANE. I FOLLOWED HIS MOTIONS; CHKING BOTH WINGTIPS AND PROCEEDED PAST THE TRUCKS. AS HE GAVE ME A THUMBS UP SIGNAL; MY L WINGTIP PASSED UNDER THE SPINNER OF A TIED DOWN CESSNA AND DENTED THE SPINNER CONE. GND NOTIFIED ME OF THE CONTACT; I ACKNOWLEDGED AND STATED I WOULD PARK MY PLANE AND SECURE IT; THEN WOULD RPT. ARPT SECURITY CAME AND A RPT WAS FILED. THE LESSON LEARNED WAS THAT I AM IN CTL AND DO NOT HAVE TO ACCEPT DIRECTIONS FROM ANYONE ON THE GND. I NEED TO CONSISTENTLY ASSESS IF EVERY MOVEMENT IS A SAFE MOVEMENT.