3.0d m sport towbar

[bizzle]

Have just got off the floor from fainting, Requested a quote from BMW dealer for the installation of a towbar inc electrics, it was £1300.00. On top of that they have now told me that all E70 X5 models require a new larger cooling fan to be installed when towing. This fitted is another £700.00. Surely having factory ordered the car we should be told that a retrofit towbar is going to cost you £2000.00 and not just £600.00 if factory fitted.
Also no where in a bmw x5 manual does it say that the car as it is is not fit for purpose, even though it states towing weights.
Any body else had a similar experience.........