Abstract: A roller curtain is provided, generally in kit form for installation at the rear of a truck, just within the doors, to provide a liquid deflector preventing the general ingress of moisture which is frequently experienced. The curtain roller is installed adjacent the roof, being usually of the spring retracted type. The curtain does not seal the rear aperture, but is generally impermeable and serves to severely limit the ingress of atmospheric moisture when the truck is in motion, to thereby safeguard the load against untoward dampness and spoilation.