A B737-400 FLC LANDED AT JNU; A CLASS E ARPT; AND HAD TO AVOID A TRUCK ON THE RWY.

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THIS INCIDENT OCCURRED DURING LNDG ROLLOUT AT AN UNCTLED SE ALASKA ARPT. WX CONDITIONS HAD BEEN RPTED AT 200 FT SCATTERED; 2000 FT SCATTERED; 4700 FT BROKEN; CALM WINDS; AND 5 SM VISIBILITY DUE TO MIST. BOTH DEP AND ARR ARPTS WERE UNCTLED. EXCEPT FOR A SHORT PERIOD AT CRUISE WHEN THE FLT WAS UNDER RADAR CONTACT WITH ZAN; COMS WITH ATC WERE DONE VIA FSS. THE FLT HAD BEEN CLRED BY ZAN FOR THE LDA INST APCH TO DEST; FOLLOWING 1 TURN AT THE IAF DUE TO PRECEDING IFR ACFT. FSS WAS CONTACTED AND ADVISED INITIATING THE APCH. A PIREP WAS REQUESTED AND RECEIVED FROM THE PRECEDING ACFT. THE ACFT HAD LANDED. THE RWY ENVIRONMENT WAS DISTINCTLY IN VIEW AT THE FAF; HOWEVER; VISUAL CONTACT WITH THE PAVED SURFACE WAS NOT POSSIBLE DUE TO NIGHT/EARLY PREDAWN MISTY CONDITIONS. UPON TOUCHDOWN AND LNDG ROLLOUT; I (PF) OBSERVED WHAT APPEARED TO BE A BARRICADE LOOKING OBJECT ON THE R MOST SIDE OF THE RWY. THE COPLT (PNF) THOUGHT THE OBJECT TO BE LIGHT REFLECTING FROM THE FLOAT PLANE BASIN ADJACENT TO THE RWY; HE LATER EXPLAINED. UPON RECOGNITION OF THE 'TRUCK' ON THE RWY; EVASIVE ACTION BY THE CAPT AND GUIDANCE FROM THE COPLT MADE IT POSSIBLE TO AVOID IMPACT WITH THE TRUCK. LESSON LEARNED: VIGILANCE; VIGILANCE; VIGILANCE; AND EXTRA VIGILANCE AT UNCTLED ARPTS. SUPPLEMENTAL INFO FROM ACN 453835: WE TOUCHED DOWN ON RWY 8; BEGAN TO SLOW THE ACFT USING REVERSERS WHEN WE SAW A TRUCK ON THE RWY. THE TRUCK WAS MOVING AWAY FROM US; HEADING DOWN THE RWY. WE SWERVED TO THE L AND AVOIDED CONTACT WITH THE TRUCK. THERE WERE NO RADIO CALLS BY THE TRUCK; NOR WAS A NOTAM PUBLISHED OF THE RWY BEING CLOSED. FSS NEVER ADVISED US OF THE TRUCK BEING ON THE RWY.