I wouldn't call them slick. More like they work better than nothing.
But yer still gonna have a certain degree of struggle depending on the type of rim, tire size, condition of tires and rims, etc.
You will want to mount the base to something solid. I have seen them mounted on wooden pallets, tree stumps, and truck tail gates. Saw another on a Reese hitch.
I clamp mine in a large vise on the workbench. A little bit higher than I'd like but it works.
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