Hi .... I would like to assist you with your question. From your description of the symptoms/noise you are hearing it sounds like a common problem we have on these vehicles. The problem will most likely be your rear driveshaft on the vehicle. The drive shaft has a center bearing made of rubber that wears out and causes it to shake violently. To fix it the driveshaft will have to be replaced. The bearing unfortunately is not replaceable by itself. Contact me if you have further questions on this issue.
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Super sigh... but thanks! I realize there is probably some local varible, but what do estimate a reasonable cost for this would be? Do I have to sell two children? (just kidding...)