Estate planning is not a one-size-fits-all game.  Mobile homes are not real estate, but putting real estate in a corporation sometimes is a good idea.  

Here's a corollary to my axioms "90% of the people who have a living trust don't need one, but 90% of the people who need a living trust don't have one" and "90% of the people who buy annuities shouldn't, but 90% of the people who should buy annuities, don't" --

"90% of the people who put real estate into a corporation or LLC, shouldn't; but 90% of the people who should do it, don't."

But your answer does point out the confusion in the question.  Did the clients inherit a mobile home, or did they inherit shares in a company?