Not a '65 TW but a '67 Globetrotter.
The additional leaf was attached with a plastic hinge. This folded over on top of the larger lower piece that is attached to the slide under the window shelf.
The slides are like the ones under the front couch, framed and kept in place with a window sash lock.
To extend the table unlock the slides, extend the leg and flip over the leaf.
These pics were handy. I may have more as I rebuilt that table when the plastic hinge began to fail.
AirForums # 2806
WBCCI / VAC # 6411
Not All Who Wander Are Lost.
Avid supporter of trailing edge technology.