The certificated commercial pilot started a southeasterly takeoff run on a 700 feet long airstrip. He added that the airplane's acceleration was slow due to wet, tundra-covered terrain. As the airplane neared the end of the airstrip, just before it became airborne, he turned the airplane to the left to avoid striking a truck parked at the end of the airstrip, and the left wing struck a cabin at the end of the airstrip. The airplane sustained substantial damage to both wings and fuselage. The pilot said that there were no preaccident mechanical anomalies with the airplane.