Thanks for the converter photo. It's not the same as mine, and probably not a Powertron, but it might still work the same way. I can't make out the brand and model information on the top - can you read it, or get a more detailed photo of the label?
1979 Boler B1700RGH, pulled by 2004 Toyota Sienna LE 2WD
Information is good. Lack of information is not so good, but misinformation is much worse. Check facts, and apply common sense liberally.
STATUS: No longer active in forum.