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Ever drive a fully loaded forklift @ 3 ton in an amazon warehouse? 48v series DC can give you all the performance you would want, up to perhaps 30 mph where performance starts to fall off because of back emf. Less weight and higher ratio gearing might get you to 60 mph but cooling and battery capacity becomes an issue here. I've never operated a new multi phase forklift so I can't comment on one of those, and they might be higher voltage. The other comment: I have seen golf carts go suprisingly fast. I also don't know your regulatory system so it may be possible to use the battery system with a voltage doubler scheme on your existing motor/ controller. Back in the day, 48 volt FLA systems were all you had. Didnt stop people from making Los Angeles freeway capable cars. Whashisname Ed who lived next door to Bill Nye had a RABBIT like this
 
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