I contacted Curt Mfg. to ask if they plan on developing a hitch for the X1 and, if so, when it would be available.
They responded that they have recently gained access to an X1 to develop a hitch, that a new design is being developed but it would require substantial testing.
It will be a while (??)
Their Customer Sertvice advised checking their website until an X1 is an offered "model".
At least they are working on it.