As answered earlier. I recently moved from a 96 class A towing an HHR at a total of about 17,000 pounds. I live in colorado on the front range. When I headed east it was great and plenty of power, when I turned the other direction my right leg always cramped before I got over the mountains. I have completley enjoyed the diesel truck with a fifth wheel at about the same combined rate going up and coming down and especialy at the pumps. I drive the same truck for a daily commuter and that is when I question the sanity of going to a gasser.
Nope, I'm stuck on the power.