Depends where you can locate your new panel, if you can disconnect the incoming wiring and move it to the new panel, then you could run new wire to the incoming connection. I would use a panel with big enough lugs on the input so you put both the incoming wires as well as the wire going to park model panel under the same lugs. There is no reason to install additional 50 amp breakers for the trailer, just one 30 amp double pole for the dryer. You will have to watch what you turn on while the dryer is running.
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