A few years ago I used Turo for a day while in Hawaii. It was fine, I would do it again. However, I was not going too far away from civilization and I was not on a cruise.
I do not know if there is a turo here in Skagway, but if there was one I wouldn’t use it. If you are wanting to travel from Skagway to Emerald Lake in the Yukon on the Klondike Highway, I would only use a rental company or tour company. Once you leave Skagway, you have no cell service until you get to Carcross. If you broke down, what would you do in the middle of nowhere? If someone did stop for you, would they take you to Skagway or drop you at the Canadian border? Would you get back in time for your all aboard, and would you just abandon the Turo? This sounds like an exaggeration, but it’s not. Don’t take the risk, it’s not worth it.