A front and rear wheel assembly having an axle housing with a wheel rotatable on a shaft at each end of the axle housing and a connecting member connecting a central portion of each axle housing. A right and left side upright support frame affixed to a top surface of each axle housing between the connecting member and the wheel. The upright support frames each have multiple engagement ridges on a top surface and side edges adjacent the top surface. A movable planar platform is slidably mounted with its C-channels enclosing the side edges of the support frame. A latch portion of the movable planar platform having a downwardly directed spike engaging the engagement ridges on the support frame. Lifting of the latch allows movement in or out of the planar platforms with respect to the connecting member to accommodate containers of different widths resting on the planar platforms.
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