Here is some information I got from another site regarding the PT
Cruiiser and towing (it probably applies to many small cars with high
HP and turbo):

Many big rig trucks have turbo-diesels, but a turbo diesel is a
different animal than a turbo gasoline HP engine. One is designed to
work under heavy loads for long periods of time, the other for short
bursts of power.

While HP is good, low-to-midrange torque is what pulls the trailer.
Comparing typical full load numbers isn't the best way to check for
this. These numbers are from a dyno pull with a load at full throttle.
Sounds good, but this is very short term. It doesn't match a long hill
at speed.

Weight and size make good tow rigs. The PT Cruiser could have 800hp and
900 lb/ft of torque and it would still suck at towing. It doesn't have
enough weight/mass to control anything with weight.

You also want something with lots of cooling and brakes. These are not
areas where the PT has a surplus.

The suspension and driveline must be able to support and pull the load.
The PT suspension isn't designed for big loads, and while a few might
disagree, RWD is the best way to tow. A frame is good, but not
necessary. Unfortunately, darn near all unibody cars are not designed
with a real strong rear area to attach tow equipment.