This is what I found on wikipedia.
"Title washing refers to transferring a vehicle's registration for the express purpose of removing a title brand.[12] The practice is legal, and practiced by the insurance companies themselves,[13] Title brands such as "salvage," "junk," and "rebuilt" are not standardized, and a vehicle which has such a designation may receive a clean title when registered in a different jurisdiction. Further, vehicles imported to or exported from the United States and Canada are issued a clean title, even if they have been involved in an accident. Other states have relatively lax inspection criteria to remove the salvage brand.[2]"
What you need to know is the specifics. What state do you need to transfer the title to so that when you transfer it back, it will be recognized as "rebuilt?" Thats what you need to know.
Salvage title
try researching title washing specifically?