Just an update on this.
I bought a waterproof "Tarpal" from Landay bazar. Didn't have to visit, just got it on the phone from "Data Tarpal House". Their number is 0321-7502275. I got an 18x24 ft. one for Rs. 6,000, and although it was pretty big, it helped me get a lot of covering.
To tie those up, I got two ratchet straps from http://fullthrottlepakistan.com/index.php/en/car-care-accessories-2/ratchet-strap-big-detail I ordered the big ones, and honestly, if adequately tied up, only one would have been enough, or one can order two small ones. Use the hooks available on the inside of the bed to tie everything up.
I encountered a fair bit of rain on the way, but this method was effective as the luggage remained completely dry.
Unfortunately, I forgot to take pictures of the loaded truck for this group. Hope it helps.