the xs diesel is a great tow car,i pull a swift charisma 565(1480mtplm) with mine and it never wobbles. Brilliant.
I will check the handbook tonight and let you know what my max braked trailer weight is but i am sure its 1800kg.
just a little hints, change the pollen filters,otherwise you will suffer rom lots of condensation on the inside of the windscreen if you use the aircon a lot.. The pollen filters are hiding behind the glove box.
edit - which is quite lucky for me as its not, its 1600kg and my van is 1500kg mtplm......