It seems that there is no friction on the ground or on the water. The wheel always moves at a lower height drop until you exert control or stop at the lowest point of an area. The landing leg will walk inexplicably. It seems that the floating process on the water surface seems to jump a little exaggerated, even if considering the water waves, the frequency seems to be faster. I hope it can be improved.
In addition, I came up with a plan, I don't know whether it is feasible. That is to establish a double-layer structure on part of the surface of the planet. The upper layer is a very thin opaque layer similar to water body. You can pass through it, but there will be resistance and levitation. The lower layer is a rigid surface that cannot be crossed. This may make the sand and the snow that may exist in the future more realistic.