QUOTE (Captain Jim @ Aug 2 2009, 07:59 AM)

Having towed small trailers for years, I can't even begin to imagine putting a hitch on the IS250. I highly doubt you'd have a transmission left by the end of your first trip.
Really? Do you think the IS transmission is poorly made?
The U.S. specification IS250 is a fairly heavy car (3,400+ pounds) and has about the same power-to-weight ratio as the first Lexus LS I bought 19+ years ago and used to pull a utility trailer hundreds of times with no ill effects. That old 1990 LS400 is still doing fine with its current owner at over 275,000 miles. I've had a trailer hitch on almost every car I've owned since the 1960s and have never had a mechanical issue caused by towing a trailer.
Oddly, outside North America, the Toyota Motor Company thinks that the Lexus IS is completely suitable for towing.
Here is a screen image from the Lexus U.K. website that describes the towing capabilities of IS220d (Diesel) and IS250 (gasoline) cars sold in the U.K.:
There is nothing different about the IS sold in other countries that makes it more acceptable for towing.
A bonus of having a hitch is that it allows using a receiver mounted bike rack -- unlike with a car top bike rack, with a receiver bike rack there is no wind noise, little/no risk of damaging the car, easy for a short person to load a bike, it provides a stand for for working on bikes and you don't have to worry about forgetting that your bikes are on your car top and crunching them on an overhead structure.