You don't want to be pushing through a stoplight if you are unprepared or underbraked( by neglect or design).
This is the thing that most people forget that scares me when towing anything. It doesn't take many downhill grades, or tight twisty down hill corners to start losing brakes on a little car. It takes caution to do so safely. Brakes and suspension are more of a determining factor in what a vehicle can carry than power.