Very nice trailer! I am fairly sure that they stopped making these in 1981 maybe 1982. Your is definitely a later unit. The doors on the middle of your gaucho, (front couch / bunk) are not original. Do you have any pictures of them open?. Some notable features:
is a Coleman forced air unit. Very rare.
It has a kitchen window.
It also appears to have a door window.
It has a the child restraint for the upper bunk.
It appears to have a 14" vent. Also rare. Good for putting in a powered vent.
The table has a leaf.
For those who would like to see the ad:
Trillium Trailer for sale - Markham / York Region Travel Trailers, Campers For Sale - Kijiji Markham / York Region Canada.
, stove, furnace
, working great, bunk bed, dinette table converts to double bed, awning
, new tires
, second owner, clean, kept original.