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3 14's would be fine and I wouldn't be bothered with 2 16's. But, if the machine can handle the load, I'd just as soon get more work done with each pass. It seems everytime an ambiguous question gets asked, replies come with a dozen factors attached. I haven't carried my tractor down to the local tractor weighing scales, but it probably goes close to 5500 lbs. That being said, I understand OLD and GLORIOUS iron weighs twice as much with the same HP output as the newer machines and made tons of drawbar HP. Most of those fantastic incarnations had armstrong steering, no hydraulics, drank gasoline, maybe 6 gears but more like 4 and beat your liver out while you sat in a steel pan seat. Been there and done it, but admittedly less than many of the old farmers here. I understand this an antique tractor site and I enjoy visiting everyday. Old machines are interesting. So are B17 bombers and P 51 Mustangs. But they ain't B2's or F16's. As these aircraft cannot be compared, neither can 40's, 50's and 60's era tractors be compared to those of today. There are so many different factors involved with the machines of now compared to those of yesterday that allows lighter tractors to perform the work of the old heavy and clumsy tractors.....efficiency has been greatly improved in all areas...not just fuel consumption. I just don't buy into the old adage of heavy weight to pull a certain plow. I'm not denying it, but most power is delivered to all wheels nowadays, there is better weight distribution to said wheels and the newer machines devlope more HP compared to their ancestors.
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