The X5 has 2 engines
3.0L, 225hp, 214 torque
4.4L, 282hp, 324 torque
I have no doubt the 4.4 would tow the boat with ease but the 3.0L gets 3-4 mpg more than the 4.4L. The 3.0L actually "feels" more powerful than my Jeep but I don't know if that holds true when a boat is back there. They also have ventilated brakes which I was told with by awesome for stopping with the boat. The have 3 different automatic systems to help with towing, control, and hills.
I may ask him to let me borrow it next saturday and drive it to the tournament and back and see how it handles.
I can't beat the wholesale price I get. Its about average tradein value by black book.