We drove the Dempster in 2016, in a truck and TC. It was raining on the way North and Dry on the way South. So very muddy north and dusty south. We didn't see any Class A on the road, some short Class C a couple Class B, and several TC. The place we stayed in Inuvik arranged our flight to Tuk, and they also have a van that they pick up people in Dawson, drive them to Inuvik stopping at Eagle Plains( the halfway point) arrange their flight to Tuk and them drive them back south on the Dempster to Dawson. They have an arrangement with one of the campgrounds on the outskirts of Dawson for people to leave their rigs there while on the trip. The owner said most of the clients didn't want to get their coaches dirty. And like others have said the mud sticks like glue. There are 2 ferries that run almost continuously at different points on the highway. I think Tripalot might be thinking of the bridge across the McKenzie on the road to Yellowknife, it opened in 2012.
The Dempster was the highlight of our trip, and neither words nor pictures truly capsture the essence of the area.