In Nebraska, you can use an old tag after they "approve" it, and only need the one tag on the back, but it is not for regular, everyday use.. just for going to parades and meetings and stuff like that.
I know you're in Texas so what they do in Nebraska dosen't mean alot.. but I mention it just because if you are planning on using the truck for a daily driver, or even drive it to work sometimes, you may also want to check to see what kinds of limitiations Texas puts on using an old tag.
