These electric lawn/garden tractors were made in the early 70's. There are many still around, especially in the North-East U.S. Attachments included snow blowers, plows, snow blades, roto tillers, mower decks, fork lift, rotary inverters (true sine wave), welder, and much more.
I use mine to mow 3 acres using approximately 4.5-5 KWH to recharge the 6 6 volt GC2 (golf cart sized) batteries. These are heavy duty machines and I estimate the weight at around 900 lbs.
My only regret is that it does not have a manual locking differential.