Try: 'Plastic Cattle Watering Tubs/Troughs'....'Plastic Fermentation Tubs' for winemakers.
Fill one of these with growing medium, and it will be, 'permanently' in one spot. Don't forget the drainage holes....
Frank
PS: I've seen these large tubs used to great effect when surrounded by decorative bricks, stacked stones, interlocking concrete blocks, etc. The stones, etc, covers, and hides, the unsightly tubs. Plant some decorative ground cover and flowers in the tub along with the fig tree to hide the stone-tub transition. Disassemble the stacked stones if tub has to be moved.