I've got a 10' trailer (length of the bed, see below) and I've towed an X on it literally from coast to coast, and back. I got it from a member who used it to tow a race X. I've used it to tow a stock '77 X.
There are much better solutions to transporting an X, but not many that are as light and compact - two very important considerations. I load it with the front of the car to the front of the trailer. This probably works OK because of the location of the (single) axle on the trailer. Other than the obvious problem of having only one axle, the overhang in the front is also a potential issue. If you aren't very careful in tight turns you could run the nose of the X into the back of your tow vehicle.
If I'm only transporting an X that has a top on it, and not a bunch of spare tires, gas, and other race related stuff, I prefer this trailer because it tows pretty much as if nothing is behind me (I use a V10 4X4 Excursion).
BTW - I would consider selling this if someone is interested. (it's in central Illinois).
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