This should be a long shot but you may have a source of radio frequency interference near your van. Not sure how to test this theory without towing it to a different location. Could also look around for a roll jamming device that may be planted nearby. Other sources in your neighborhood? Navy radar perhaps? If so, that shouldn't last long.
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2010 Ford E250 5.4L V8 Gas 2WD
SMB Mod RB36 w/PH Prop Stove & Furn Frig 10G Wtr Elect
Silver Bullet
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