I was going to suggest with the double cab a set of awning clips fitted up inside under the opening for the canopy, and modify an old truck tarp or curtainside type PVC material (not the heavy as hell one) to fit to the canopy opening and be watertight. Then a fold out timber frame to make a bed and be able to fold up inside the tray when you are driving - it will allow you to use what you have until you decide on a replacement ride.
I'm thinking of doing this on the ranger double cab if I get it squared away from it's canbus system glitches and reverting it back into private instead of in the business. It has a ute drawer from Camco in it currently so I'm looking at that as the basis for something to be able to flip over onto the tailgate to sleep on. The canopy I have is a Fleetline with water channels on all the openings, which means it doesn't leak open or closed... A rooftop tent would be unnecessary if that could be made to work and without one it looks like a standard vehicle as you've noted...
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