Yes, this is a Trillium
Jubilee. They started making them in 1976. They are more a competior with the Bigfoot
trailer then the Boler's as they had plywood instead of fiberglass cabinets and were more upscale in fittings. If this trailer is in good condition (which it looks like it is) it is a pretty good deal - generally I see the for sale
for $6500-7500 here in BC.
However, I believe they may be heavier then the 4500's. If you are looking at that size of trailer due to weight
concerns make sure you find that out first.
You may find this thread I started last year helpful
Anybody know the history of the Trillium Jubilee
Edit: The reason that it is called the Jubilee is because it was produced at the time of Queen Elizabeth II's silver Jubilee:
Silver Jubilee of Elizabeth II