I'd imagine most of the worst credit people are buying from buy here, pay here lots. Those lots have all sorts of cars, so I dunno why there would be a brand trend, other than towards lower priced vehicles.

I find drivers of nonwork pickup trucks to be particularly aggressive on the road.

I also associate this with Chrysler/Dodge brands, unreliable cars with a higher then usual number of hotheads behind the wheel. I've seen shady finance stuff from a dealer around here, making numbers work for people who in no way can sustain payments (and later had the car repoed) it's all insured so the dealer laughs all the way... with the bank!?!