One of the exhaust hangers on the system my ute used to have, had a hanger which was bolted to the chassis rail.
Had to go thru one side of the chassis rail to get to the bolt on the other side. As i was pulling the socket out of the rail it clipped the edge of the hole i was going in thru and popped off the extension. Still in the chassis somewhere.
I predict its along side where the passenger sits!