The acft collided with a truck while taking off but managed to stay airborne, fly a mission and return to a normal landing. The private plt was reportedly carrying 8 passengers for a parachute drop. He would not admit he was carrying passengers and none of the passengers would give a written statement. One of the jumpers stated that during takeoff the plt flew the acft to the left side of the rwy where the ground crew truck was parked. The tail wheel of the acft hit theroof of the truck. One of the jumpers said that the private plt was paid to fly them. The pilot’s assessment of the damage was loosened brackets on the tail wheel attachment. No one was reported as injured.