I think the days of the mobile truck dealer are numbered. I had a good friend that owned a business with a similar model of sales distribution, and the internet eventually killed them and they went under. It's become too easy for people to get what they want from other channels with just a click of a button, the price is usually much cheaper, and many people prefer not to work with salesmen at all.
I'm not saying it's a good thing, I feel bad if a good dealer loses his line of work, but I think it's inevitable. I'm guessing the majority of people on this site buy their "tool truck" brand tools outside of the tool truck, and that's a trend that is only going to grow.
Enough dealers will either quit or go under that brands like Snap On or Matco will probably just go to some sort of company direct model. I know I wouldn't want to buy into one of these franchises right now, and I'm guessing most of the people that are currently in this business would like to get out.