Dakota,
I well remember visiting Don Duffner in North Dakota back in 1996, I was very impressed with all his green and yellow conversions, think I recall three 830's all linked together and working with a ;large set of discs in the field, I have some photo's somewhere.
Again this is to "wet your appetite" for two Ertl M-H 55's joined together, if you cannot make the long haul flight across to Bob Parke's auction in September then your next opportunity is to buy the 55 tandem model in the online auction, I will attach a link of it, lot number 804.
You can sit at home, pressing the bid key and once you have it bought it is much easier to put in a box and mail across the pond than fitting the real thing into a shipping container.
Food for your thought.
Malcolm.
Malcolm