Needles Highway

Yes you can. Tour busses do It all the time! Now Iron Mountains Road is tight and you cannot do it in an RV or even towing a trailer. But I followed a dually through the tunnels.

We made it trough one tunnel at 10 feet wide. The second one we did not, it was 8 feet 2 inches wide. I’m a good driver but I wanted mirrors left on the truck when we came out the other side. So we did not d
O the second tunnel

The tunnels are extremely narrow. We went thru with our mirrors in the tow (out) position on our 2005 Dodge 2500 and I only had a little clearance on each side. Wasn't paying close enough attention and rubbed the passenger side mirror. I can measure my truck with the mirrors out if you'd like the width. I would think your dually would be wider on the flares but they might just be the same.