At 75 pounds, they must make them out of leftover bridge girders. Better suited for completely flat trailer parks in Florida or on factory floors, I would think. I've seen one exactly twice: Once in a GM factory, where workers used it to transport loads of small parts rather than waste gas using a fork lift, and one for my nephew who has cerebral palsy. Only the starboard wheel was driven, which made it extremely inefficient - something that is unacceptable (IMHO) on something so heavy and hard to move to begin with!

With apologies to our former troll Spuds, another possibility if you can find one, is a ReTrike. They have been out of production for about 5 years, but you might find one used at a very good price.