"Trailas de renta" usually means "homes for rent" and normally refers to an apartment or a mobile home. "Traila" can also refer to the type of trailer that is used to tow a boat, more widely referred to as "remolque."
"Trailas de renta" is a phrase most commonly used in Texas and areas of Mexico that border Texas. "Traila" is not a true Spanish word; rather, it is a colloquial mixture of Spanish and English. Similarly, "de renta" is not as commonly used as its counterpart, "en alquiler." In Spanish, "alquiler" is the verb "to rent," and "renta" is a noun meaning "rental payment."