If you don't have a lift-top/vertically expanding camper, it's a good idea to install lanyards from your cab rack to the front corners of the camper.
Scott Brady suggested this when we tested with him and I built and installed some while we were exploring the U.S. Rockies & Pac NW prior to leaving for South America.
I have no idea how many times I rebuilt them before I finally got the right proportion of shock cord to stainless steel wire. I quit counting at five. If nothing else, it gave me something to do for the two years we were out.
It helps to have a vise, swage tool and a bunch of parts, shock cord and cable. (We needed the shock cord because we had a lot of movement between the cab and the payload, so the lanyards could not be taught.)
Make sure to use all stainless steel hardware for this project.
Location: Valdivia, Chile
The shock cord is tied off / wrapped with safety wire and then covered with glued heat shrink.
Stainless steel safety wire (used in motorcycle racing, available at any good motorcycle shop). This was shot before I clipped the twist and tucked it into the turnbuckle.
The shock cord held up very well to the elements. It's from an inexpensive bungee cord.
The lanyards were a Very Good Idea out in the bush. They kept innumerable trees off of the front of the camper and provided a smooth glide path to guide anything bendable up, over and down the sides. Thanks again, Scott.