No, it doesn't automatically become yours after 60 days. Which means that, if someone acting on behalf of the estate comes and takes the truck, it's not necessarily wrongful at all.
If you had any actual claim to the truck, then you ought to contact a probate attorney to negotiate with the executor of the estate and secure your claim. But unless you actually have some reason to think it's yours besides 'it's been on my property' and 'we don't know for sure who owns it,' then it's a non-starter.
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