Drove to Alaska last summer from Oregon. The drive from Lake Louise to Jasper (British Columbia) thru Banff and Jasper National Parks was very pretty.
Most small 'towns' in Canada and Alaska have visitor centers, RV friendly parking and lot of local info.
The National and Provincial Parks in Canada (one we stayed at) were nice, no hook ups, pit toilets.
The Alaskan State parks we looked at/stayed at were not very good (poor roads, small spaces, no hook ups). Stayed as several US Forest Service camp grounds in Alaska, very nice, but no hook ups. If you are old enough, be sure to get a US government 'senior pass'. Half price camping at Forest Service and National Park camp grounds, as well as BLM and other Federal camp grounds.
From what I remember there are not a lot of pull outs or wide spots along the road to pull over (lunch, etc).
Get a copy of Milepost, it takes awhile to figure out how to use the guide. We had no problem getting fuel, gas, but we filled up at almost every small town, We did not travel later in the day. We did not run into a bug problem, but have talked to people that said the bugs (mosquitoes) can/will keep you inside.
peteinlapine