Gary, as you know, you have a whole lot more RV for your $ with the 5ver than a TC.
If your equipment is in good shape, you and the vehicles, lol have at it.
It's only mid July. You could be there before the silvers start running this year!
I've only driven the Alcan in the spring so there was not a ton of traffic, but during tourist season I don't believe you'll be alone for long on the trio if you're worried something may happen you'd need help with.
At 75, do it now while you still can. And bring your fishing poles!