Washington has a "bonded" title...however, unlike the name would infer there is no actual "bond" put up. I bought a small boat and trailer from a guy with no titles and the trailer had no VIN on it. I took it to the Washington State Patrol and they engraved a VIN on the tongue. I took the bills of sale and forms from WSP to the DOL and paid to become the "registered owner". If no one comes forward in three years the state will issue me titles for each. I can't miss or be late on a renewal or the 3 year clock starts over.
I also have an Army HUMVEE trailer I have converted for over-landing. It too doesn't have a title, and I need to take it to the WSP for another inspection. I haven't gotten around to it, and sadly have now owned the Army trailer for close to three years, and would have had a title already. However, during COVID the WSP appointments were virtually impossible to obtain.