I don't know your model or trailer outlet, but having flash/tail/turn/side is a good sign. Is the light over the door normally on with the tail lights? Check what pin the door lamps are wired to and see what it corresponds to on the tractor. At a trailer plug you need at least one ground connection, then separate circuits for various things, depending on model variants. Do you have a service manual for the tractor with a wiring diagram in it? Do you have a diagram for the trailers you just bought? Do the lights work on other trailers when plugged into this tractor?