A sled test apparatus for simulating a vehicle crash is configured to simulate a vehicle crash involving an intrusion into the cabin of the vehicle, as occurs, for example, in a so-called “small overlap” or “offset” impact. The apparatus has a sled carriage and a test buck. The sled carriage is mounted for linear movement along a test axis, and the test buck includes a first structure mounted to the carriage for guided movement relative to the carriage. The test buck further includes a second structure mounted to the carriage, and the first structure is configured to move relative to the second structure during the guided movement.