Not only in cold weather. Good luck trailing something big for a long distance even in the summer. In my model X the range is reduced to hardly 150 miles. Really inconvenient.
What do you mean by trailing? Like, driving on a trail? Like an off road one? Why would you do that in a Model X?
This is like the argument that LED traffic lights are bad because they don't get hot enough to melt snow on them.
It's something that doesn't matter most of the time and when it does matter you use something else. LED traffic lights started getting built with heaters in them.