FIG. 1 is a front and side environmental perspective view of portable tray attachment for vehicle showing my new design with the trays in an open position, the portion of the figure shown in broken lines representing a vehicle seat and forming no part of the claimed design;

FIG. 2 is a front and side perspective view thereof, showing the trays in a closed position;

FIG. 3 is a front elevational view thereof, showing the trays in a closed position;

FIG. 4 is a top plan view thereof, showing the trays in an open position;

FIG. 5 is a bottom plan view thereof, showing the trays in an open position;

FIG. 6 is a side elevational view thereof showing the trays in an open position, the opposite side elevational view being a mirror image; and,

FIG. 7 is a side elevational view thereof showing the trays in a closed position, the opposite side being a mirror image. The securing straps shown in FIGS. 2 through 6 are shown broken, and have been eliminated in FIG. 7 for greater clarity.

The rear view of the design is plain and unornamented.