wheel jack for the elderly

my idea stems from watching my grandfather change tires hes between being capable and and almost needing help and i though it would be a good idea if as part of a jack set have a wheel jack that could lift a tire for those who are prone to back pain or are physically weak. i picture a jack with large wheels and the ability to roll over semi rough terrain and it would hold a tire and could be rolled and jacked up to installing a new tire would be that much easier
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