These wheel chocks are very strong but their rubber compound offers much more grip than plastic chocks. I bought these because they are a bit more tapered and have a lower profile than many other wedges. My main purpose is to use a step leveling ramp to level a POPUP camping trailer. Their low profile and taper make them well suited for this application. Because of their size and shape, I think they would be less suitable for use on my tractor's 20" wheels. Size up on both and choose the appropriate size but for my needs these are perfect. hp They stink". The rubber smell is quite strong. But it flies and this space in the trunk, tool box or motorhome storage space. where they don't smell. :-)
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