Towing through Eisenhower Tunnel

Thanks for all of the comments on this post. Today we made the trip over the Straight Creek Pass and through the Eisenhower Tunnel. Seems as though my concerns were unfounded. My Duramax did a great job of pulling. The temp never left the center position, 210 degrees. I kept my speed at 45 to 50 mph on the climb and on the descent down the 7% grade. The new exhaust brake along with the tow-haul mode made the descent without having to use brakes. I actually had to keep a little pressure on the accelerator to keep from slowing below 45 mph.