Durango, CO to Grand Junction, CO without using Hwy 550?

Size of our 5th wheel is also a lot of my concern. The trailers basically 42' long and every bit of 13' 6" tall. I know there's some tight tunnels on the way north to Ouray, just don't recall how much clearance they have.

I've driven down 10% grades so that's not too big a worry. I only drive fast in the flats, twisty roads and ascents/descents I'm like a Sunday driver with nowhere to be!