how it should work this collateral? are you planning to ship the car? are you able to register to another buyer (so in this case this should be the loaner...)
or maybe easier... why you just don't ask locally this loan using directly your car? how to check conditions... if any

it seems your cousin 2 years ago try to sell something for you
https://www.reddit.com/r/ChrisBrown/comments/1eeivnr/looking_for_las_vegas_show_tickets_83/other users have not been happy about that...
without a reliable collateral (or someone that could take care in person) this is not a valid solution.