My solution to washboard roads is an adequate air supply. I've been over a lot of washboard and if it seems interminable, just lower the pressure on your tires down to 30 or 26 pounds, depending on how heavy your rig is and that you don't have 19.5 tires. Truck tires now are miles ahead of truck tires of say 20 years ago and can take a beating. You don't need deadlocks to do this. Just keep your eye on the tire temperature. I use a 20 pound CO2 tank with appropriate hardware (like a hose that won't freeze up in use) to get the tires quickly back up. One tank will bring my truck tires up from 28 pounds to full inflation (65 or 80 pounds) about 40 tires-worth. This is all a technique holdover from my jeeping dayz. I have used those pressure specific, screw on deflators with some success, although these are not an exact science. For most of my time deflating i simply unscrew the valve core keeping it in the stem and hope i don't skid through the intersection. It's a feel you develop after doing it for a long time.
I've was over the Burr Trail in about 1972 and it seemed like just another back road in my FJ-55 Toyota Land Cruiser pulling a jeep trailer. Never used anything but 2-wheel drive. Very scenic. I can see how a lot of pricip could spoil your day.
jefe
'01.5 Dodge 2500 4x4, CTD, Qcab, SB, NV5600, 241HD, 4.10's, Dana 70/TruTrac; Dana 80/ TruTrac, Spintec hub conversion, H.D. susp, 315/75R16's on 7.5" and 10" wide steel wheels, Vulcan big line, Warn M15K winch '98 Lance Lite 165s, 8' 6" X-cab, 200w Solar