User blog comment:McCorkle/So.. Eddy's brother is a "Whaler"./@comment-224939-20180720035145

Eddy's Brother lives n a whale shaped trailer because it's an ocean-themed amusement park.

Eddy has been known to exaggerate or outright lie about his brother's life.

Eddy presumably learned at some point what his brother's residence looked like and figured it would make sense to hyperbolize his brother's occupation to be that of a whaler in order to make his story more interesting when he tells it to people.