Hi Frostyricho,
I'll let others answer your concerns regarding DSOs but I'll jump to your question about wheels.... just go to Bunnings and buy three small rubber caster wheels and screw them to the base (see my picture). It won't help with stairs but one a flat surface it will make it easier to move. Mine were not 'lockable' but you can get lockable wheels - a feature not needed on grass however.
Cheers,
Stephen
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