Ron, unfortunately, this type of behavior runs on every forum. I mod two other forums (non-RV related) and we have the same type of posts. Someone comes, makes a post and that's the last you hear from them, or if they do come back, they don't respond to their original post, it's to post a new problem. Short of sending them a PM or email asking them to respond, there's nothing you can do, and even then, there's a good chance you won't hear back from them.
