What is the maximum user weight?
220lbs is merely the max RECOMMENDED weight, above which the top speed and range may be slightly affected in some edge cases but will not impact the safety and integrity of the product.
We have, in fact, beta-tested Moonwalkers up to a much higher weight limit.
Again, you can use Moonwalkers like everyone else if you are happy with slightly reduced performance in edge cases like reaching 90%+ of the top speed at the steepest hill.