You don't get a title in most states, as mentioned. I bought one camper in Florida and got a Certificate of Origin from Lance. Looks just like a title, including a place to sign off a sale on the back. I also bought one in Delaware, and got the same Certificate of Origin from Lance as well.
I do not live in a state that requires Truck Campers to have a Title. I sold one of the campers a couple years ago. The Certificate of Origin was sufficient for the sale. If you do not have CoO, you should speak to the Manufacturer or the dealer where you purchased it originially.