Travel on any of the unpaved roads in the north country is a crud shoot. It all depends on when the last pass from a road grader occurred. Recently, no problem, not so recently, the washboard can shake your teeth out, regardless of your speed. If they've just had rain, you deal with a LOT of MUD. If no rain, you choke on dust.
All that said, a great adventure. If you don't want to deal with road and rig conditions, check out van tours. We flew to Prudhoe Bay, spent two nights there and toured the oil fields to the Arctic Ocean shore and they drove us down in a van (2 days with a stop overnight at Coldfoot). Toured a lot of interesting places and did not have to deal with reservations, road conditions or damage to our rig, contents, or toad.