Propane supply valve is stuck

Thanks for everyone's advice, especially those who told us to go to a propane dealer rather than a rv shop. Our problem appears to be solved, and we're cringing a little thinking what could have happened. As per your advice, we took it to a propane dealer. At first he thought we would have to empty the tank, but he kept working on the valve and was able to close it. Here is what he told us probably happened. The RV dealer probably torqued the valve while opening it and never closed it. So we traveled home over 200 miles with the propane going full blast, never knowing the propane was on. We then stored it for a few days before taking it out last weekend. The park ranger thought the propane valve was closed when it was actually all the way open, so when he used his channel locks it made it open even more. Now the propane is off and everything works correctly. No Kaboom! However, I do feel like blowing up at the rv service dept. for their incompetence.