Most do. I prefer not to carry any more than I absolutely need to. I wouldn't be concerned about 16 or so hours a year on my truck from tailgating. That's just me, though. Exhaust is a concern, but as much as is blowing around tailgates anyway, I doubt it would really matter much. IMO.
That being said, GM shuts us down at 15 minutes, so it won't work anyway. Basically the plug, in this case, IMO, is useless. There are a about 50 ways they could have tried to make it useful, but they didn't. Unfortunately.