Those tires will carry 140 lb of Rim Guard each.
While duals contribute to stability, they create a couple of other problems. They limit maneuverability . A 4' wide tractor becomes 6' wide and a GT can't handle a 6' bucket on the loader to clear a path wide enough for the tractor to pass.
While they improve flotation when dealing with soft ground conditions, it has to be remembered that the small front tires of a loader equipped tractor actually carry a heavier load than the rear tires. The maximum load on the rear tires is half the weight of the bare tractor, plus the weight of the operator and any ballast applied, including an implement on the 3PH. The rated max implement weight for your tractor is 400 lb. The max static load rating for the rear axle is 1500 lb, including what is on the 3PH. Wheel weights and liquid ballast are not carried by the axle, but there is a max weight rating for the rear tires as well, and that can only be achieved with duals and considerable ballast.
Bottom line, duals are an aesthetic application. There are few loader tractors in the real world that are equipped with duals. The agricultural community will put a loader on a field tractor with duals when required, because it is a major undertaking to remove duals that weigh upwards of a ton each.
For reference, the GT pictured below is carrying 400 lb of applied ballast weight, and can lift and carry 600 lb in the 210 lb 54" bucket in this configuration, and still has the same traction capabilities as the same tractor without the loader and applied ballast. The implement normally carried as additional ballast was omitted due to restricted maneuvering space in the 3' deep excavation of my driveway. With 40 years of GT loader experience under my belt, I've never come across a situation where duals would be an asset.
Wow, only in PA!!!
I saw one for sale in WI a few years back. The arms are a bit further apart than needed for most GTs because of the wide hood.
The FF series are really Boss looking tractors when all decked out.
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Sometimes you get on a roll, sometimes the roll gets on you.
MF GC2310, Husqvarna YTH20B42T
Down for Repairs
MF1655 w/ FEL, MF1655, MF12H, MF8H, MF7H
Spending too much time on MTF to work on my toys.