You are asking a great question.
You did not state the year or model trailer you have.
Adding the will may help.
You mention wire and static/electronic hum. That leads me to assume (I know) you are talking about AM reception not the FM.
If AM yes a longer wire will help also put a longer wire on the ground lug (there is no wire there now).
Most people do not realize the antenna on the care is only have the other half is the body of the car. So you lengthen the antenna and then put a better ground plain by adding wire to the ground lug on the receiver.
try to run these wires in opposite directions that helps also. The aluminum frame should not make that much difference.
I hope this helps.
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