Deluge Error?

There seems to be a problem on the Deluge map. I have driven the truck with the box loaded on the back worth 2 garage points and the garage trailer worth 2 points to the garage. When I pull into the garage area, it lets me unload the box but it won't take the trailer. The trailer is attached by the winch so I don't understand why it won't unload the trailer into the garage. I'm stuck on this map with a locked garage, please help.

@itzyaboy305 A trailer has to be attached by metal, not just a winch, for it to be used.

Hello all. You have to connect your trailers via advanced mode.