I need help wiring get this trailer

Get out your jumper pack or a 12V battery. It's easier with a jumper pack because you can use the clamps to your advantage. With a 12V battery you have to supply your own jumper wires and make up some sort of probe.

Attach the - to the trailer frame.

If you're using a jumper pack, put a nail in the + clamp to use as a probe.

Poke each connection with the probe and see what lights up.

Black, green, and white in an orange sleeve sounds like someone used an extension cord and cut it up to wire the trailer. Those colors are not standard for a 4 pin connection.
Those 3 wires are likely the left and right signals and the running lights. Ground was likely just the frame. I would suspect the blue wire as being electric brakes, blue is the standard color for that. In order to have electric brakes you must have at least a 6 pin connector (like you removed). However, most large trailers use the 7 pin. The 7th connection usually adds back-up lights.
Assuming your trailer has brakes it likely needs them to be highway legal. I strongly suggest you wire it for a 6 or 7 pin connection and add the proper wiring and brake controller to your tow vehicle.

If your trailer has the ELECTRIC BRAKES Installed then you will need the standard 7-Way wiring... 4-way wiring is usually only for small utility type trailers for just DOT safety lights...

Wire colors differ for different manufatures

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Check with ETRAILER.com on-line for wiring diagrams for the trailers including the RV types...

Roy Ken