What motivates the major chara? Are their motivations or wants explained outright or revealed over time?

Perseverance is one of Tucker’s finest qualities, and something that he instills in everyone who surrounds him. Despite production or promotion hiccups, Tucker perseveres and comes out an ever grander hero than before. The running joke in the film lobbed between Tucker and his engineers is who does and who doesn’t think it’s possible to build the car according to their scarce resources and strict deadlines.