On level ground the ZInger Chair is pretty good.
It is very dangerous when trying to drive it down or up a ramp, especially where turns are involved.
It's not going to happen.
Why? Unless you are pulling up on the direction levers the chair is in neutral - no control whatsoever.
Think about that!
Plus both tires require 42lbs of pressure - lose pressure, you can lose control and not everyone has an air compressor handy.