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I am sorry you are dealing with this situation. If you can prove that real estate company knew the mobile home was manufactured in 1972 and actively concealed this fact from you and it is not something that you could have easily discovered then you would have a fraud and misrepresentation claim against the real estate company.
Unfortunately, if the seller is unwilling to reach an agreement to compensate you for the damage they have caused by this misrepresentation you would need to bring a lawsuit seeking damages. Often in these cases, to get the seller to negotiate and discuss the matter with you will take retaining a local attorney. I realize this is the last thing you want to do and want to spend money on.
In addition, if this was a licensed real estate company with the State of Washington you can file a complaint with the licensing board and the Attorney General consumer protection division. While neither of these agencies can force the seller to compensate you for you losses and damages, they can issue fines, penalties and sanctions against the real estate company.
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