I've had those. They are OK if needing to pull a dinghy up a concrete ramp, or to move it about on level hard ground, but completely unsuitable for sand, beach landings, rocky shores, and other more challenging conditions.Have you used them? What are they like?
You will want something like this: Beachmaster wheels USA store Canada store
Or this: Dinghy Wheels DaNard Marine Dinghy Wheels & Marine Products - %