Hey, I think you downloaded the esx_jb_trailer script. Please note that this is not my script. My script is this: GitHub - TheAimWolf/esx_trailermanager: Put vehicles on a trailer and securily transport them.
I put his resource in, because some maybe dont want to drive the cars on the trailer, but want to simply click a button to attach the vehicle on the trailer. And TanguyOrtegat’s script gave me some great advice of how to work with trailers in fivem. So if you have issues with his script, please contact him on his thread here. I hope I could help you. On this point, I don’t see any issues in my script, but feel free to tell me if something is going wrong 
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