A GA PLT PERFORMING TOUCH-AND-GO LNDGS ALMOST HITS A PICKUP TRUCK THAT CROSSES THE RWY DURING HIS LNDG TKOF ROLL.

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MADE 3 TOUCH-AND-GOES AT MHR WITH MY SON AS THE R SEAT PAX. WE NOTICED; WHILE WE WERE ON DOWNWIND; A PICKUP TRUCK PARKED NEXT TO AN ANTENNA ON THE S SIDE OF THE FIELD. (I REMEMBER THE TRUCK BEING JET BLACK; MY SON THINKS IT WAS RED.) ON THE FOURTH TOUCH-AND-GO; I LANDED ON CTRLINE; BUT DRIFTED ABOUT 30 FT TO THE L OF CTRLINE ON RWY 22 DURING THE TKOF. SUDDENLY; I SAW THE PICKUP STARTING TO CROSS THE RWY AHEAD OF ME. I APPLIED R RUDDER AND SWERVED TO THE R; XING THE CTRLINE TO AVOID HITTING THE TRUCK. AFTER ENTERING THE RWY; THE DRIVER OF THE TRUCK MUST HAVE SEEN MY ACFT; BECAUSE HE SUDDENLY BRAKED AND STOPPED THE VEHICLE. AFTER TAKING OFF; I DEPARTED THE PATTERN; CONTACTED SAC APCH; AND RETURNED TO MCCLELLAN FOR ADDITIONAL TOUCH-AND-GOES. DURING EACH OF THE LNDGS AT MATHER; I ANNOUNCED MY INTENTIONS; IN ACCORDANCE WITH AIM RADIO PROCS AT UNCTLED ARPTS; ON XWIND; DOWNWIND; BASE; AND FINAL. I DID NOT MAKE ANY CALLS WHILE ACTUALLY ON THE RWY; BUT HAD ANNOUNCED INTENTION FOR A TOUCH-AND- GO WHILE ON FINAL. I HAD LNDG; STROBE; POS AND NAV LIGHTS ALL ON. AFTER LNDG AT MCCLELLAN; I NOTIFIED THE SUPVR OF FLYING FOR FBO OF THE INCIDENT.