When dealing with the AMHS, the ferry system, remember it is operated by the state of Alaska, as subsidized transportation for the residents of SE Alaska. Hence, walk on passenger tickets are reasonable, freight cost are not too bad, but put a large RV on the system and you will pay for it. However it is about the only way to see parts of SE Alaska, as the ferry ships tend to be able to go in closer to shore than the deeper draft cruise ships. I have been on the ferry system about 4 times as I think back, two of those with our truck camper, the others as a walk on passenger. It isn't a trip that I would want to do every time, but for a once or twice experience, it is great. Yes it is costly, but so is a trip to northern Canada and Alaska.