For those interested in building a popup type of camper assembly for any truck, I suggest contacting a sailboat soft dodgers (awning style) or even hard dodger builder. Most fabricators will be located on saltwater coastlines and are small businesses. They use stainless tubing and canvas to build a shelter that must be fairly strong to withstand heavy wind and spray. Generally, they're collapsible and held in place by straps. They of course have windows so the crew can see forward.