If you submit a vehicle to the Marketplace; does it have to be setup with Blueprints?

You can but in all honesty for us folk who aren’t exactly skilled in the whole game development area it wouldn’t be a buy at all for us for a static mesh even if it had all the pivots. If it was animated, rigged, easy to setup then that would be a buy from us. it all depends on the market your aiming for along with the kind of profit margins you have in mind.