You can add pretty much anything you want to the back, as long as it's offset by weight in the front.
Theoretically there's no real limit as long as it's well balanced from to back. But in the real world it'll get harder and harder to steer the more weight you add, and your tires are only so wide so they'll start to sink more and more, and your brakes will work less effectively - especially on hills.
So I don't think there's a hard and fast number to give you - the answer is more "it depends". Err on the side of lighter.
Aside from the weight - there's the torque required to spin a big mower. Sure an A could spin a 6' mower - but through what? 6" high Kentucky blue grass? probably. 1' high wet pasture - probably not so much.
I wouldn't go more than 5' - and that's assuming you're doing grass - not using it as a brush hog.
keep in mind too that a big mower is going to continue to drive the tractor even with the clutch in - that surprises people, often at a very bad time to be surprised!
If you're using it just for grass - I'd also consider turf tires to avoid leaving tracks everywhere.
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Today's Featured Article - More Memories of a Field Service Engineer - by Brian Dye. Introduction: The author worked for one of the largest Ford tractor dealerships in England as a trouble-shooter on tractor engines, hydraulics and combine harvesters from 1963 to 1972. In 1972 he became a dealer manager and finally left the dealer net in 1975 to run his own electronic design and manufacturing company. [Editor] We live right in the middle of Norfolk. The dealership that I worked for sold Fordson Tractors from the 1920's and some of t
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