Joe, I was only able to find one at http://www.fracino.com/. The only propane machine is had drawn, which is both good and bad (asthetically/physically). Adrian, the son of the founder has been great on the phone and I plan to visit their shop in Birmingham, UK in two weeks. Let me know if you want me to look for anything in particular.
I like your truck, I''d love to have one here in Krakow. A great little van conversion I found, also in the UK: http://www.towability.co.uk/Site-page.htm I just got my roaster up and running a few months ago, and having a lot of fun with it. Good luck with your biz. JK