Michigan just has registration
for some classes of trailers, no title
but campers have a title
. Know it is different in different states.
Think you can apply for a title here with a bill of sale "from the owner of record". Trick is to be sure your buying from the owner of record.
If state of purchase has titles for this type of camper (sec. of state can answer that) why can't seller apply for duplicate title, give you copy of application and bill of sale (with notary witness).
You might have to wait a bit for replacement title doing that, but here they offer "instant" or expedited service to get a replacement title for a fee.