Rear shimmy/shake 50+ update
Thanks to everyone for the helpful information. I took it to the tire shop tonight and they found that both inside duals had tread separation and the outer duals had flat spots. So had 4 new tires put on and the ride is much improved. Now I can relax and enjoy our up comming trip.
2017 Grand Design Reflection 303 RLS
1997 GMC Sierra 3500 Dually