As noted by others, CO 9 would be a better choice, even with the construction...assuming you are coming from Carmel CA. Continuing on EB from I-70/CO 9 in Silverthorne, you'll have to go up and over the Eisenhower/Johnson Tunnels before you even get to US 40 at Empire for Berthoud Pass. And that's really out of the way.
If, however, you're travelling WB from Denver, it's really an either/or for what you're comfortable with. Climb Berthoud Pass on US 40 and be done with it, or continue on and go up and over at the Tunnels before getting to CO 9. Either way, you've got a climb to do, with inherent potential weather issues. As for climbing any of them, your combo of the 3500 1 ton duelly with your trailer will likely not be a problem.
