The pilot executed an approach and landing to Runway 17, a 1700 foot long, 75 foot wide, turf strip which he owned/operated. During the rollout, the aircraft's left wingtip impacted trees and a dead snag along the east (left) runway edge. On site examination revealed the aircraft's wheel tracks gradually angling toward the east edge of the runway. The nose gear was observed to have separated in a manner consistent with side imposed overload and the right main gear was observed to have collapsed due to the same conditions. On site examination of the electrically operated flaps revealed no damage/deformation in spite of the aircraft collapsing onto its right wing during the ground slide. The airport owner (pilot) published a recommendation in the 1991 Airport Master Record that landings be made from the south except in strong south winds. The pilot reported winds at the time of the accident as from the southeast at 3-5 knots. Post crash examination of the brakes and throttle linkage revealed no mechanical malfunction.