Question, are you operating any equipment while the hissing is present, the reason I am asking is that a microwave for instances can effect auto with a hiss and it can effect video with lines and alter the sound. There is one other problem that you may not know and that is when your camper was wired there is a posibility that they ran high voltage supply lines too close to low voltage wiring. All of your 120v wire is high voltage compared to speaker wire and running them together is not code, they must be seprate. With out getting too technical, the fact is that control and /or low voltage wiring must be isolated from high voltage.
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