I winder if you can convert a refrigerator dolly to do the same job. Probably cheaper to fabricate it, unless you weld up a fixture that you could bolt onto the dolly and remove when you were done...
That makes me wonder about positioning the tines. Should be parallel to penetrate easily, but the center ahead in a slight "V" might ease it in tougher soil.
Sincerely,
Toolmaker51
...we'll learn more by wandering than searching...
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