you MIGHT find a dealer who would let you do that provided you have all of the necessary equipment and want to pay to have it set up for the particular trailer. Not really sure what you're wanting to find out from the test though. Tow ratings tell you how much you can tow and handeling is pretty much a matter of how things are set up. Might have better luck hitching up to a friends trailer with your truck or better yet a friends trailer with a similar truck that is already set up. I think if I were looking for a new trailer and was told that the one I'm interested in was used as a test vehicle I'd sure expect a big discount or just pass on the deal.