I carry 2 20ft lengths of 1/4" nylon lines in my truck bed secured at opposite corners. I keep them stowed by running each fore and aft around the fwd or after tiedown point. I also keep a cargo net hooked with a corner hooked to each corner tiedown point and the side hooks on the fore aft running ropes/lines.

The cargo net kept spread out is a great plce to place and mostly secure bagged groceries (and other things) contained. Each bag is inside it's own little square of cargo netting.

"If you cut the rope too short, you can always splice it. If you cut the rope too long, though, there's nothing you can do about it."

Dagwood