The airline transport pilot was on a Title 14, CFR Part 91, personal cross-country flight when the accident occurred. The pilot said during takeoff from an off-airport site the airplane hit a bump, and became airborne prematurely. When the airplane settled to the ground, she said the right main landing gear wheel landed in a depression, and the right main landing gear collapsed. The pilot said the right wing struck the ground, and the airplane veered to the right, side-loading the left main landing gear which collapsed, allowing the left wing to hit the ground. She said there were no known mechanical problems with the airplane prior to the accident. She said the airplane sustained substantial damage to both wings. Due to the remote location the airplane has not been examined by the NTSB. The pilot did not submit the required 6120.1 Pilot/Operator Aircraft Accident/Incident Report.