Just a thought, some years ago my uncle had an early model Farmall cub with just a 42" woods belly mower. Although it was easy to get around with, mowing was painfully slow even in lighter grass I think the engine is only rated at 10 or 11 horse. My grandpa has the newer version (IH 184) with a 60" mower and it has slightly more power but still a slow go. Both are gear driven not so easy to maneuver around obstacle's.
It might be worth looking into a super GT they are heavy built machines many were designed to run 60" mowers, most have power steering, most all have hydraulic lift. Supers also have hydrostatics which I personally like for mowing.
Just my 0.02 cents best of luck on your search 
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IH cub cadets 800x3,1000,1100,1200x2,1250DS,1450,1650DS, 71,122x2,123, 73x2,106,107,126x3,127,147x2,86x3,128,149, 169x2 ,Original, cadet 55, to name a few
CCC machines
1282,1050,2072,1535,1440
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