We drove to Alaska and back from california in summer of 2015 in a 34 foot class A motorhome. The Alcan is paved, but not a freeway. The roads aren't any better than a 2-lane state highway, with plenty of damage from traffic and winters.
Our motorhome is built on a Ford TRUCK Chassis, stiff leaf springs, on truck tires with over 100 PSI pressure. We felt and heard every bump. Our dishes, pots and pans are right behind our seats. We slowed way down when there was road damage.
We noticed that people with trailers often drove by us at much higher speeds with their trailers bouncing around behind them. Those occupants probably didn't feel or hear the bumps like we did. They had late model pick-up trucks with plush seats and much softer suspension and tires. We heard of people stopping for the night only to discover that their microwave had ripped out of their cabinets and were on the floor or found their hinges sheared on the refrigerator doors.
You can realy damage your rig if you aren't careful. Be careful, take plenty of time and enjoy your trip. It should be the best vacation you have ever taken; it was for us.
Mike