Only the wind between Vernal and Steamboat, but that would be worse on I-80, not better. And how are you getting from Jensen to I-80? US 191 north of Vernal has steeper grades and more hairpin turns than anything you would have on US 40 in Colorado!
US 40 is a good 2-3-lane road, with 3-4-lanes on the uphill to Rabbit Ears Pass and 6 lanes on I-70 to the tunnel. 4-6 lanes on I-70 from the tunnel to Denver.
One alternative route would be to leave US 40 at Muddy Pass (just south of Rabbit Ears) and take CO 14 through North Park to Fort Collins. Two-lane road to US 287, but you wouldn't have any more trouble with grades than on I-70. Very scenic, much less traveled by tourists than the I-70 route, and you might stop at the only Colorado State Forest campground with electricity along CO 14.
For more info on US 40, possible sights/stops, and pontential campgrounds, take a look at my blog HERE.