YOU SAID:

I have a pet that has been working on a trailer

INTO JAPANESE

トレーラーで働いているペットがいます

BACK INTO ENGLISH

I have a pet that works in the trailer.

INTO JAPANESE

トレーラーで働くペットを飼っています。

BACK INTO ENGLISH

I have pets that work in the trailer.

INTO JAPANESE

トレーラーで働くペットを飼っています。

BACK INTO ENGLISH

I have pets that work in the trailer.