Exactly my line of thinking. This seems like a good compromise. I won't go above 60 mph, at least not at first. It is rated at almost 1200 lb payload, but will be carrying roughly half of that. My biggest concern is the potholes. Big plus is that it's foldable and will take less space, and good for when you buy a bulk item from Home Depot, etc. I will try to get a bigger wheels, but not sure yet how do you figure which wheel will fit -the hub size and the fender obstruction.
Again, will be using it to the track which is 150 miles or so one way, and for occasional local stuff.