In a way, this is a personal decision, but since you asked:
The 1976 Trillium that I bought states an empty weight
of 1095 lbs. I haven't weighed it, but I believe it does weigh every bit of that. So you're already potentially over by 100 lbs.
Another factor is that I believe on some cars (please double-check this) you have to subtract the weight
of the vehicle's cargo and occupants from the towing figure.
Next is tongue weight, which will vary depending on what's mounted up front on the trailer tongue.
Do you plan to tow the trailer ever again once you get it home? If so, spending $400 for a hitch on a vehicle that you clearly can't use to tow on a regular basis seems to be a bit of a waste. By that I mean that if you plan to actually use the trailer (i.e. tow it), you'll have to get another tow vehicle anyway, so maybe save the hitch money for that? Perhaps borrow or rent a tow vehicle for this trip.
If you were going five miles down a country road - and already had a hitch - I'd think "Okay, go for it." But Victoria to Vancouver is a bit longer than that, with traffic and a ferry ride to boot. You could be putting other people and yourself in danger.
Does the Trillium have trailer brakes
? Will your car be wired to use them (i.e. you must buy and install a brake controller on the tow vehicle). This would make it less dangerous, but again it seems like wasted expense/effort since you can't really tow a Trillium with that vehicle.
I guess my answer really boils down to suggesting you get/borrow/buy a different tow vehicle, even for the trip home. I would be more "yeah, do it" if your vehicle was rated for even 1500# (although even that would be cutting it REALLY close over the long term when loaded for camping).
On the other hand: New Trillium for you! Yay!