Haydn-
I know the Dallas PD stolen auto number is 214-243-2026. THey will be open in the morning. You prob have called them, but if you have not they keep good records of criminals and such. Like was said, maybe they went into Dallas. Big city, easy to hide among the masses. I bet the COPS there know about morons who maybe like to take trailers...
Good luck.
CB77
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CB