Use 2nd shore line
I have the same problem in my TT. I solved the problem by using a second power cable from the campgrounds electrical pedestal to the radio's power supply. No noise and I can still run the AC, etc. I cut a hole in the back wall of the TT and covered it with a outdoor duplex receptacle cover. The 2nd power cable, antenna coax, etc. are easily pushed through for use and pulled back out when not needed. The cover (gray) doesn't destract from the TT's looks and it is waterproof if you keep the gasket in place.
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