If they have title they have ownership. Will they maintain insurance for fire, theft, liability in your name. Will they be offering you a contract against the company assets and their personal assets? What happens if the MH does not sell for the agreed price? If their concern is your availability to conclude the sale then arrange for an Escrow or have the title held at a bank. Come to think about it: What if you didn't have the title and the title was held by the bank, would you be expected to pay off the loan before they would accept consighment?
Sounds fishy to me.
JMHO