Trolley wheels turn strenuous tasks into simple tasks. Attach them to the bottom of an object you move frequently and see how convenient it is to roll, rather than carry, items. You can put them on a car, chair, table and even a suitcase.
With trolley wheels, you either need an axle or individual wheels with base plates attached. In some cases, you may only need two wheels. See what you can move with trolley wheels.