Except when a person is using a truck that is not up to the job, it is flat out dangerous. My wife and I were on vacation a couple of years ago and were leaving Arches National Park. We were behind a late model Tacoma and the driver was pulling a travel trailer. The speed limit on the highway was about 65 - 70 mph. When this person started to approach the speed limit, we could see daylight between his front tires and the road. It was a two lane highway that had passing zones every 5 miles or so. When we hit one of those passing zones, I could not get away from that truck fast enough.