Keith,
The wife and I went south at Laredo in November last year. We were with a small group (9 bikes, 1 trike and one car). The car had more troubles at the checkpoints than we did. They ALWAYS waved us through and ALWAYS stopped the car. The only time things went any further than waving the car through the pull off area, the driver got out, opened the back of the Expedition, showed the guard the luggage, and pointed to us. The rear was quickly closed and they were told to get out of the stopping area. There were 2 CVO Ultra's, mine and the wife's. We went as far south as San Juan de Los Lagos. The border towns are the worst, but if you find the right border town, you may be okay. Things have escalated since November, so I wouldn't make the trip we did now. But we were with Mexican Nationals who knew what to expect and what to do. I wouldn't have gone on my own. We didn't have a problem anyplace, but the leadeer knew where to go, where to stay and how to keep us all safe. As previously noted, you can get into problems in Boise if you get into the right area. Good luck with whatever your ultimate decision is.