This is what I use. It covers front and back seats and has mesh in the middle to allow for air flow from the center console vents. It also has zippers to allow you to use the single seat of the rear bench if needed. Very happy with it...
I haven’t used it yet but this is what I have. It’s designed to be used with the seats folded up.
https://4knines.com/products/floor-hammock-for-crew-cab-trucks?variant=32952799035453