Alaska bound from Calif

yes you can cross the ferry with the 5th wheel from Vancouver Canada to Victoria, I don't know if the one out of Bellingham I think it is allows rv's or not.  just look up the ferries and cheek it out.  it does get very expensive taking a trailer on bc ferries though.  I lived in Victoria for 20 years and never took the trailer off the island until I retired from the navy and they paid the bill for my final move.  prices have gone up yet again, so my truck and 5th wheel is 56 feet long.  it costs 19.10/persona over the age of 12, it is 67.40 for the first 20 feet of car/truck and then 7.50/foot over that so for myself the wife and my setup it is 443.1 each way on the ferry.  Oh and add 20 bucks for the reservation.  its smart to get one in the summers or if you can't afford to wait a few sailings or even till the next day when it is real busy.

now on the BC ferries they do have fare savers and specials on the lesser used routes where you can save some money.   in the summer they usually have a "size up the savings" or something like that where the excess length on certain sailings is about 50% of the regular 7.50/foot.  you just got to go on the web page and look as it gets closer.  

you could take a ferry to the island from Tsawwassen (Vancouver) to Swartz bay (Victoria) then when you leave you could go from Nanaimo to horseshoe bay (Vancouver).