With the demand for this kind of feature being quite low, its something that you'll have to go down segment for. The X Class was never designed to be a workhorse, and I bet there will be very few of them that will ever leave the pavement.
Beauty of it is, if demand suggest some owners want a workhorse, Mercedes can release a spec tailored to those needs to test the market. Already they have products like the Metris and Sprinter that are workhorses. So the idea isn't far off from happening.