Why does ProPride not answer

I am in the market for a used Airstream excella or classic, mid 1990s to early 2000s. I have pulled many campers and decided to upgrade to a ProPride hitch. Because I almost always buy anything used, I decided to buy a used ProPride 3P. The reason I chose ProPride was all the great reviews on the Pivot Point Projection type hitches and the excellent customer service being touted by all the owners of the ProPride. I found one in Atlanta, negotiated and bought it. The previous owned told me he had been trying to contact ProPride about the warranty transfer but with no luck, but I thought maybe he had not really tried. Well, after 4 emails now (2 directly, 2 through their website) and a phone call with a message to return my call I have had no luck. The only thing I have not done is try to call the owner directly on his cell phone. Have they went out of business? If not they really need to work on their communications platforms. If the only way to contact them is through the owner then the website should say that. Anybody know anything? Thanks for any help.