Try going here.
My AV does not like that siteTrend Micro Internet Security has identified this Web page as undesirable.
Address: http://www.cashforclunkersfacts.com/
Credibility: Dangerous
This site should work better...
http://www.cars.gov/index.php/faq
How do I know if my car or truck is an eligible trade-in vehicle?
Note that work trucks (i.e., very large pickup trucks and cargo vans) have different requirements.