I use to live in Arlington from 2015 to 2018, but only went down around I-20 about once a month so not sure if that would have been me. But thinking back to my time there, I don't know if I ever saw another X in Arlington.
yeah its been a few years, but both times ive seen one it was parked. once near legend dr. and another time at a store off i-20. could have been the same truck or maybe not.