First since their is a good chance that peak oil will help initiate a chronic recession of some other sort. A lot of these rioting poor will be former six figure incomes and hard working middle class. Economic problems will drive them into the poorer areas. Next the only reason I focused on the poor is that they are the ones who would suffer demand destruction first. In general its anyone who is living on the edge or past it regardless of income that has to work. A lot of Americans cannot suffer a few hundred dollar increase in expenses since they are in debt way over their heads. Persistent 5+ dollar a gallon gasoline coupled with attempt to use monetary inflation to hide uncontrollable rises in resource prices to keep the economy going will ensure widespread price inflation. When your customer prints the money he pays you with life is interesting.

The first people that are effected are the working poor who live with what I call the shiftless poor. And I grew up in Holly Springs Mississippi so I'm familiar with all the various forms of poverty its not just someones income.

I don't expect it to stay contained as you mention. But I would suspect the wealthier people would engage in marches and the like that will eventually be brutally put down.
One thing about suburbia its not a good place to have a old fashioned riot since the government offices are downtown you have to attack something. Suburbia either by accident or design is effective at limiting active political action.