I have a Judgment against me for approx $1,600.00, can they take my work vehicle and sell it toward debt money I owe them ($500), they told me no, I could not say "no". Doesn't seem fair, doing everything I can to help husband pay this dr. bill.

Who is "they"?

In the US, property exempted from seizure for debt goes by state.
Try the links here and ask if you have more questions.
https://www.nolo.com/legal-encyclopedia/property-exemptions

It depends on who's name the vehicle is in, what the laws are for your area, etc.

It is possible, but not that likely.