How to Say "trailer" in Spanish
The most common Spanish word for “trailer” is “avance” — use 'avance' when referring to a short preview or teaser for a movie, TV show, or other media..
avance
ah-VAHN-say/aˈβanse/

Examples
Vi el avance de la nueva película y parece muy buena.
I saw the trailer for the new movie and it looks very good.
El noticiero mostró un avance de las noticias de mañana.
The news program showed a preview of tomorrow's news.
caravana
kah-rah-VAH-nah/ka.ɾaˈβa.na/

Examples
Pasaremos las vacaciones en una caravana cerca de la playa.
We will spend our vacation in a caravan (RV/trailer) near the beach.
Necesitas un coche potente para remolcar esta caravana.
You need a powerful car to tow this trailer.
Towed vs. Driven
Mistake: “Using 'caravana' for a large, self-propelled RV in Spain.”
Correction: In Spain, 'caravana' usually means the towed trailer. For a motorhome (the self-driving type), use 'autocaravana'.
Movie Preview vs. RV
Related Translations
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