John D, I don't know where the Dalton and Dempster Highways are, but PV Stoy said it. Lower your air pressure. I usually start with 15 lbs lower and adjust from there depending on the severity of the washboards. I carry a "standard" 260 psi pump and it takes forever to fill those babies back up when I need to, so you learn how much to reduce pressure in relation to the road. God, how many hours/days/weeks have I spent rattling my teeth over washboards? Some people say speed up and it gets better, but I don't think so. With 6 vehicles over 23 years, I have never found that to be true. I say, slow down, enjoy the view and be glad you are driving over a desert washboard road. The alternative could be dismal. Besides, the faster you drive over washboards, the worse they get for others. There are several sites on the internet exploring the physics of washboards, their origins and their perpetuation. Apparently, the faster you go, the more your tires dig into the low spots creating a greater depth. I don't recall the reason for their origins. The next time you see some guy (or girl) creating a dust cloud seen for miles on one of them roads, driving too damned fast, flag them over and educate them on the physical attributes of washboards. Everytime I have done that, people look at me like I'm a crazyman, but they seem to slow down. No need to hurry out there unless you have an emergency.