The ornamental design for a portableoverhang for a recreation vehicle, as shown and described.
FIG. 1 is a left elevational view of the overhang.
FIG. 2 is a right elevational view of the overhang.
FIG. 3 is a rear elevational view of the overhang.
FIG. 4 is a front elevational view of the overhang.
FIG. 5 is a top plan view of the overhang; and,
FIG. 6 is a bottom view of the overhang.
The broken lines of FIGS. 1-6 are included for the purpose of illustrating environmental structure and form no part of the claimed design. The material illustrated is intended to represent any form of material including solid, transparent, translucent, and screen materials.