Was just on the phone with an old friend who has built two gorgeous units in the past and he suggested stretching the frame leaving the tandem axles on. He said 8' from the centre of the rear wheel should be good for overhang as long as there is enough height to give ground clearance as Bob and Geof suggested. 20degree angle sounds about right then Geof. That should also give good weight to the axles.
Thank you very much for the advice guys, Looks like a stretch job is a must.
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