the h/duty tow pack is a totally different package. You have to remove what you have on there and fit the new one if you wanted that. You'll be able to tow a car with your current setup.
I've got the same EL with a 1600kg tow pack. I've towed my XB and many other cars inc an XB wagon.
XB Fairmont (street car) firstname.lastname@example.org.