Sir, I'm an ODSS member but have not been to Carlisle. Where are you located? ODSS members meet often and usually the most meet up annually late Sep at the ATHS Winchester, VA event. I can't help you with the history of your 41' half ton, but perhaps other ODSS folks could provide you some leads. Thankd Farmone. V/R, Nick Cavallaro, Bel Air, MD