It brings up further questions about your proposed design. They show 3X8 rectangular steel tubing for their frame on the 24 ft model. But they do not give any spec on wall thickness, and no spec about the tensile strength of the steel. It is likely they are using a high tensile steel for the stringer members (as would be common in truck frames and much farm equipment).
Next up, a design which is good for 24 ft is likely to fail when stretched to 30 ft. The main span is just too long for the weight it needs to support.
As to the o'hang distance, it is measured from the center hub of the wheel if it is a single wheel, and from the center pivot point if it is a tandem. From the photos, the front o'hang exceeds 3 ft if you measure to the front of the extension which keeps the bales from rolling forward. With a tamdem axle, the rear axles should be carrying a minimum of 2/3 of the total weight, and probably 70% is more realistic. Thus the need for more rear o'hang (and consequently a better turning radius).
But you are going to design and build this wagon, and I have only offered advice as you requested. So in the final analysis, do what you want to do. I provide advice based on my experience in building 4 of our 10 hay wagons, and the experience of many years of teaching physics (thus the design theory), and the lessons learned from my son who has a Masters in Ag Engineering. By no means do I think I have all or the only correct answers, and I am certainly open to other's ideas and possible solutions. But I do think my advice was on track.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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