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Old walkie/rider trucks were built using contactors only.Old Barret, Big Joe ect. have 12v to 36v motors, the contactors, possible sufficiant wiring and the control devices necessary for a lawn tractor. They will use more power at low speeds than electronically controlled units, though. The curtis contolled trucks have been around since the mid to late 80s so a cheap set up should be available also. The problem with a lawn tractor is battery storage and the sheer weight of it all on soft ground and slippery grass. Extra wide turf tires might be wise to reduce depressions in the soil and traction issues with upgrade mowing. The center of gravity will need to be low enough to avert tipping on hilly terrain. With a large flat lawn, a power trailer would solve all the issues including range.
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