The vehicle history report can fill in the blanks. In other words the last owner that was registered, whether it was the dealer or someone in Georgia. From that point, and with your temporary registration, you should be able to make some progress.
If you find the previous owner in Georgia, you can contact them and find out what their deal was with the dealer and whether or not he ever got his funds from the sale. If it is still registered to him, he can then issue you a title if you can prove that you bought the coach and bypass the dealer completely.
