The Towing Prep package includes upgraded radiator, transmission oil cooler,
130-amp alternator and trailer prewiring; 4-cylinder models add: 3000-lb.
towing capacity, engine oil cooler, power steering oil cooler and 120-watt
fan coupling; V6 models add: 3500-lb. towing capacity and 160-watt fan
coupling

Upgraded radiator is probably not going to be easy to recognize unless you
have a standard one to compare it to.

Transmission oil cooler: look for 2 lines that look like brake lines going
from the transmission to either the radiator or to a separate heat
exchanger.

130-amp alternator: Alternator amperage may be listed on the window sticker
or on the alternator itself.  Otherwise, there is no easy way to tell.

Trailer pre-wiring should be obvious: look for a place to plug in trailer
lights somewhere near the hitch.

Towing capacity is listed in your owner's manual, on the manufacturer's
certification label on the door, and sometimes on the hitch itself.

Engine oil cooler: look for a cooler somewhere near the oil filter.

Power steering oil cooler: look for a cooler attached to a line coming from
the power steering pump.

Just look for the oil cooler. It will be located in the air scoop in
front left hand side in the bumper lower area. If it has the cooler, it
has the tow package. And of course, if it already had the hithc, it has it.

Always get the white sales sticker off the window of any new
car you purchase.

That sheet lists all that is in your car and it should say it has
tow prep package or whatever.

The other way is to go to the dealer and give them the VIN number
and let them run it through Toyota to see exactly what is on your
vehicle.....they can tell you.

-G-