Hello to all BMW lovers

I owned a BMW X5 4.4i and I love it.

I would like to tow my boat (21f 5000lbs) with my X5 but not sure if it is possible or safe.
Not to tow all the time, only when I need to pulled it out of the water in October to a 40kms ride to the storage place.

Does anyone know if it is possible?

Thank you