Abstract: A portable transit mix unit comprising a support base and concrete mixer drum thereon, is provided with rollers movably connected to the base whereby the base can be elevated out of engagement with the bed of a truck or lowered to support the unit directly on the bed. In the elevated position of the base, the unit can be rolled off of the truck bed onto a support stand. This enables the truck to be used for other purposes while the unit is supported on the stand. The stand includes a tiltable platform which when inclined forwardly, facilitates transfer of the unit from the platform onto the truck bed.