Here's one of a W164 towing a 60 ton A319 Airbus. [:D]

The factory-fitted package of measures will in future include the new Mercedes-Benz Trailer Stability Assist (TSA). This is an extra function incorporated into the ESP Electronic Stability Program that is designed to offer drivers even greater safety when towing a trailer. TSA is capable of detecting the dreaded fishtailing motion swiftly and nipping it in the bud effectively. To do this, it uses the ESP program's own sensory system and initiates precision brake applications at the front left and right wheels individually and alternately to stabilise the car/trailer outfit. TSA will make its debut in the W 221-series Mercedes-Benz S Class, after which it will be made available for further model series successively. It is due to be added to the specification of the M-Class from late August 2005. It was first introduced in 2001 on the BMW X5, supplied by Bosch.