No. If you have properly installed 220 volt electrical service all outlet and load center grounds should be isolated from the trailer and only go to ground at the main box. it is not a perfect world though, so I would not take it for granted. if the dryer has never gotten hot where you live now, a professional electrician is the only way to go.if it worked and one day stopped, suspect the heating element. remember please, 220 can kill you easy and can even jump quite a distance if conditions are right
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