In Texas it is a royal PITA to title and register a vehicle that does not have a title. The biggest issue is it has to be inspected by law enforcement to verify that it was not stolen. For Carrollton there is only one place that does this. That is the Dallas County Sheriff's Stolen Vehicle Task force. They only do the inspections one weekend a month and you have to take the vehicle to them. When I built my trailer I had to go through this to get a VIN so I could title it.
In Ft. Worth you may have better luck.