The ornamental design for a mixertruck with a four door cab, substantially as shown and described.
FIG. 1 is an isometric view of a mixer truck with a four door cab from one perspective, showing our new design.
FIG. 2 is an isometric view thereof from another perspective.
FIG. 3 is a right (driver) side elevational view thereof.
FIG. 4 is a front elevational view thereof.
FIG. 5 is a top plan view thereof.
FIG. 6 is a left (passenger) side elevational view thereof; and,
FIG. 7 is a rear elevational view thereof.
Shading and tangency lines in FIGS. 1 through 7 represent the three-dimensional contours of the design, and are not intended to indicate surface decoration. The broken lines in FIGS. 1 through 7 are for illustrative purposes only and form no part of the claimed design.