Let me qualify my idea, I'm in California and I probably couldn't find Whidby on map, let alone what services might be available there, but I am familiar with not wanting to tow our boats further than necessary. So here it is, have you looked into self-storage lots or indoor boat storage in Whidby? That way you tow it there once each season, using the ferry out and back once. If you are like us and use our boat several times a month, then the offset comparing ferrying costs for a month vs. storage rental rates might work for you. For instance, I store my drift boat where I use it most, for the months I want it there for around $125.00 a month and there is a little fuel savings as well along with wear and tear on the tow rig. Also, if there is a marina, boat builder, boat sales company, etc. at Whidby you might be able to get them to store the boat for you.