There's no way I'd want to regularly pull 7-9000 lbs with any half ton, especially in the mountains where I live. Some do and with the proper packages it can be done within ratings, but heavy duty trucks are much better tow vehicles, especially the diesels. Go drive some HD models and see what you think - they're a lot more refined than they were even just a few years ago.
The truck in my sig is my daily driver and I love it, even just commuting in traffic. Compared to a half ton it has a stiffer ride but that's such an inconsequential factor it's meaningless. I don't really see any reason to buy a half ton unless you really just plan on using it as a people hauler and you buy it in place of a full size SUV. Heavy duty trucks don't really cost much more, they're not materially less comfortable to drive or live with on a daily basis, and they're a lot more capable. Seems like a no brainer to me.