Trd is not a model it is a submodel. Neither any 2018 Tacoma for Tundra is listed by either motrhomemagazine it Fmcaas towable. Actually no 2018 Toyota truck is tiwable. I even checked the owners manuals and both trucks require all 4 wheels off the ground for any towing. There Are no optional transfer cases for ANY Toyota truck. All are electronic with no neutral. I think you are confusing today,scomplicated electronic vehicles with Toyotas from years ago. I had a 2005 Tacoma and had to install a diveshaft disconnect. For some reason theJapanese mfrs. Don't want to approve vehicles for towing.
Moisheh