After unsuccessfully trying to get the keys duplicated to our 05 Bambi at a real hardware store (which had a section of the store devoted to keys/locks, and whose owner prided himself on being to duplicate any key). The owner himself cut some keys, but said they may not work, and he was right. We finally had to go to the AS dealership where we bought the trailer. They told us only Airstream, or their dealers could supply the blanks. They only charged $3 per key, but it even took them two tries to cut the keys right because they used the wrong TriMark blanks the first time.
1968 Trade Wind
2007 Ford F250 4x4 Crew