I may have a contender for this use. Taylor Dunn has made electric utility carts for decades, mainly for industrial uses. I just picked up a B2-48 that was made in 2005. It already has a solid-state controller. One downside is there isn't a lot of room between the seat and the steering wheel and foot pedals. If you are a large-frame person you might have problems. However, they are considered bulletproof. The one I got is rated to carry something like 3,000 lbs and tow 12,500 lbs. That is probably on a level paved surface, but still that is more than I will ever need for work around my homestead. There are configurations available with a 2nd row of seats and I think they will fold down to a larger flatbed.