Greetings, Larry H here.
I don't have a Ranger Tug but do have a 37ft trawler and have done the Inside Passage many times.
Some notes on the Inside Passage.
In B C, Canada, the Canada Coast Guard radio covers the main areas. Their signal is loud and clear and they can help with most emergencies or problems. If you stay on the main track, there will be comercial and yacht traffic. Cruise ships, large ferrys,tugs with tows, fishing boats, and fishing transport boats will be seen every day. Canada requires all vessels over 65ft to report to marine traffic control all the way up the Inside Passage. You can listen to Traffic on the VHF to know when and where the big guys are.
Port Hardy is the most northerly town on Vancouver Island and has most supplies you might need and is connected by highway on Vancouver Island to points south. I would refill fuel and water tanks and the food larder there.
The area north of Port Hardy is the most isolated. The towns with services are Bella Bella/Shearwater, Klemtu, Hartley Bay, and Prince Rupert. Shearwater has marine supplies, groceries, and a haul out. Klemtu and Hartley Bay are smaller native (First Nations) villages that have fuel and limited groceries. The longest stretch without fuel is from Klemtu to Hartley Bay, and then from Hartley Bay to Prince Rupert. Prince Rupert is a large city with all supplies available and is the Port of Entry when returning to Canada from Alaska. Prince Rupert is on the main road system and is about 1,000 miles from Vancouver (city).
Cell phone coverage is available near Port Hardy, Bella Bell/Shearwater, and Klemtu. Prince Rupert has cell coverage, but in 07 you had to subscrive to the service in Prince Rupert as US phones would not roam there. After crossing the US/Canada border in the Dixon Entrance, cell coverage on a US system is available. Most towns in SE Ak have cell coverage. Many remote areas in SE Ak do not have any cell coverage
When you cross the US/Canada border north of Prince Rupert, you have to report to Ketchikan to clear US customs. You can also resupply in Ketchikan, where all supplies are available. Southbound, you will have to report in to Canada Customs at Prince Rupert.
You might want to consider taking any spare parts that would be hard to obtain locally. I carry a spare propeller on my 37 ft trawler as is is an unusual size. Float planes can deliver parts to your boat almost anywhere on the Inside Passage but the price is high.
Anchor gear shoud be robust, with 300 ft of line, chain and anchor. A second anchor and rode which can be used as a stern hook or a replacement for the main anchor should be carried. I would consider buying a main anchor one size larger than normal. I like to sleep soundly without worring about the anchor holding. Many anchorages are 50-60 ft deep in SE Alaska.
The docks in BC and SE are usually high wood docks with a 'bull rail' to tie to. These wooden rails can be hard on dock lines. and fenders. I would have fenders and dock lines that are robust, and larger than normal. You may have to raft up with other boats in crowed harbors. Have enough fenders for both sides of the boat.
I hope to see you 'on the coast' this summer as we are planning a SE trip in the Jacari Maru.