Have you seen a John Deere 20A? I don't know if JD still has the relationship with Goldini, but these units will handle hills...

At 32 in. wide, the 20A Tractor is designed specifically to operate in rows as narrow as 4 ft., performing a variety of tasks including cart transport, sprayers, mowing and ground preparation. Equal-sized wheels, a 39-inch wheelbase and a low center of gravity maximize the tractorr stability.
If you need more horsepower check the F-Series Tractors(Goldinis manufactured for JD)
At home under almond trees, in pear orchards or vineyards, the F-Series Orchard and Vineyard Tractors deliver 76- to 96-engine hp, 4-wheel drive and 4-wheel braking, and open-station or low-profile cab options. With a lift capacity of more than 5,000 lbs., the F-Series can handle heavy rear implements like loaded gondolas and full sprayers, even on steep terrain. Designed and built from the ground up as an orchard and vineyard tractor, the F-Series is made to meet your specialty crop needs.