"バン”は「Van」「People carrier」「Minibus」という英語を使えます。それぞれの説明は以下です。
「Van」
Bigger than a common car, but smaller than most trucks a van is normally used for transporting goods or people.
「Minibus」
A minibus is a passenger carrying motor vehicle that is designed to carry more people than a multi-purpose vehicle but fewer people than a full-size bus.
「People carrier」
A term used in British English which has the same meaning as Minibus.
I hope this will help you.
お役に立てば嬉しいです
イギリス 
