Almost all the states have a DMV website it may be worth exploring the provisions for lost titles etc. There will be some mechanism for you to register your truck (it may not be easy)!
Here in Utah you have to submit and affadavit of previous ownership they then research it and you need a vin/serial number inspection from law enforcement/certified inspector. It takes about 4-weeks usually to complete the process. I don't know about Florida but I am sure there is a something along similar lines