I do not think it is such a big deal to carry a small canister with you. Every motor home and trailer is equipped with large propane tanks. BC Ferries requests owners to apply a sticky label on them stating that the tank(s) are turned off. On the other hand, Coho ferry to Port Angeles doesn't ask at all about propane tanks.
gregn
ps: I just checked regulations regarding dangerous goods carried on the BC Ferries:
Dangerous Goods
What do paint, laundry bleach, propane, car batteries, gasoline and hay have in common?
Firstly, they are all commonly used products and secondly, by their nature, if they are not handled with care, they can be hazardous to our health and the environment. Because of the added hazard, these are classified as being dangerous goods, and extra care is required with transporting them.
There are more than 3600 dangerous goods listed in the transportation of Dangerous Goods Act, and the regulations that govern them are quite complex. In the hope of simplifying the process, we have provided a few brief notes concerning the most commonly encountered products.
If you are planning to travel with us and have dangerous goods to carry, this will give you some initial guidance. If your particular product is not listed, feel free to call your nearest terminal and ask for help. We are at your service.
For products not listed in this brochure, please call the terminal of departure for information.
For those travelling on our northern routes, the Port of Prince Rupert imposes certain special regulations. Please contact our Prince Rupert terminal for further information at least 24 hours prior to departure.
Remember, all dangerous goods must be declared at the terminal ticket booth or to a vessel officer. Failure to declare dangerous goods is an offence under Canadian law.
You decide.