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If the relative sizes make this realistically improbable, then Clown Car.
If the carrier is gigantic and the transport vehicle(s) are small in comparison, I'm not sure that's a trope. It's not unreasonable for carriers or amphibious assault ships to carry an APC or other ground transport to their destination if the need arises
, even if that's not necessarily what they were designed for.
Clown Car I Guess Because Lander Looked Like Made From Wooden+It Can Carry Tank
What the trope about Transport Vech (Like Carrier) Carrying Transport Vech (Like Bus) Example:Advance Wars:Lander Can Transport Any Ground Unit Like APC Hence The title