[68bowtie]

First off I try to give a seller the benefit of the doubt unless I have proof that they were intentionally mis-representing the truck (i.e. actually looked underneath and under the mats and knew about the rust). But when you are selling a vehicle for this kind of money, and a buyer asks about rust, I think it's at LEAST an unintentional gross mis-representation that is deserving of a refund. It's one thing to say "rust free" knowing nothing is truly rust free, but when you're asking that kind of money and a buyer is concerned about it, that's not acceptable.

For what it's worth, I'd suggest a full refund plus half the related expenses would be a reasonable settlement.