It doesn't really matter, IMHO, to whether you call it the Alcan or the Alaska Hwy as we all know what a person is talking about. I tend to use the terms interchangeably. When the OP mentioned 30 years ago, I started thinking that was about 1985, and that was not that long ago. Funny how when you reach my age, 73 currently, the oldest I have ever been, 30 years doesn't seem all that long ago.
I have been driving the highway to Alaska for the last 54 years, since the summer of 1962, then 1964, 1965, 1966 and then 1969 plus about 15 or 20 more trips but only 13 round trips by RV. The Highway is now a few miles shorter, due to the relocation projects by the highway departments, lot more of it is paved, but much of the paving doesn't last very long due to permafronst and the shifting soil under the roadbed. It is much more civilized these days, than it was in 1985, with lots of cell service, TV in some community RV parks, many more private owned campgrounds, etc. But it is still a grand adventure for most travelers. Nothing terribly difficult about the trip, just more long days of driving, sequentially, than most RVers are used to doing. And I lived in rural Alaska for just over 25 years, starting in Nome in 1964. Guess Nome could be considered to be rural, even though it was about the same size of the town in Oklahoma where I attended high school.
Vehicles have improved greatly over the years so mechanical problems seem less and less. Trailers still seem to have the most under carriage problems, with tires, brakes, axles, springs, etc. There doesn't appear to be many requirements for what a trailer builder has to use under their rigs. Class As, Bs and Cs have to meet all the regulations of the US and Canadian governments, as do tow vehicles so very few problems there. Be careful with a trailer, especially the 5th wheels as they have so much room to haul stuff and it is easy to get more weight in them than a person should. We currently have a 5th wheel and a truck camperm using the same pickup with both.
For tires on our 5th wheel it came with ST biased ply tires C rated. I didn't like the way the trailer rode with them, some tail waggle when going down the highway and they had a 50 psi air max. So I swapped them out for a set of ST radial ply tires in an E rating, 80 psi in the same size wheel, 15 inch. Maxxis 8008 tires and I have been very pleased with them. Very durable, trailer tracks well with them, no tail waggle and a lot more weight supporting capacity available. Our last 4 round trips have been with the truck camper but we are considering taking the 5th wheel next summer back for what will probably be a last go at driving to Alaska. All good things must end.
There are probably fewer functional roadhouses now than there were 30 years ago, but most modern vehicles can make it easily between fueling stations with their standard fuel tanks. If you can make it about 100 miles, then you should be in good shape. The lakes, the mountains, streams and rivers are just as beautiful as they have always been, the northern people just as great and hospitable as ever, still the trip of a lifetime for most of us, each time we make the trip.