The ornamental design for a refuelingsystem for pickuptrucks, as shown and described.
FIG. 1 is a perspective view of a refueling system for pickup trucks depicted in a bed of a pickup truck showing the design thereof;
FIG. 2 is a front view thereof;
FIG. 3 is a side view thereof;
FIG. 4 is a top view thereof; and,
FIG. 5 is a rear view thereof.
The broken lines in the drawings showing anchor bolts, washers, and portions of a pickup truck are for the purpose of illustrating environmental structure and form no part of the claimed design.