I'm interested in taking a trip from Tucson down to see copper canyon in Mexico and possibly continuing on as far as Mazatlan or so. I understand the border towns in mexico have become dangerous, but I do speak spanish which makes me a bit less concerned. Regardless, I would not be spending any time more than I have to there. So I have several questions: 1) Are the border towns a serious issue if you're just passing through? 2) How bad/slow are roads along this route? 3) Are there rental car companies in Tucson that permit travel in mexico? That permit returning the car in Mexico?