well, i'd call the tennessee division of motor vehicles (DMV) and they'll get you going in the right direction.
try this,
http://www.state.tn.us/safety/titleandregistration.htm
give them a call and ask them about filing for a lost title. I dont know about tennessee but i pretty sure you can get a new title for the truck, although it will probably cost you. you can go to/call your local DMV and they should be able to tell you too. hope this helps.
jason