Nice! It's like the tent for the Chevy Avalanche... but you know, this one actually makes sense!

4 bolts hold it to the box of the truck, 10 mins to take on/off.
2 Straps hold it all down and secure while in transit.
As is it's heavy because of the wood and bedframes I scavenged. So it helps to have two people to install it as is.

Heavy winds were fine so far, much stronger than I had expected. But the tarp zippers and a few places are a little leaky. Nothing horrible yet but I will be making another tent top with good material, using the camo tap pieces as a pattern. I may have it professionally done.
For a tent made out of tarps, well I think I did ok. :)

Still room in the truck box for standard large size tupperware and toughpak bins.
I wanted something I could pull over anywhere, side of the road if need be, in the rain, and not be soaked by the time I'm finished. With this, I pull the two straps, pull off the cover and use that as a umbrella, grab the ladder and pull. Whole thing folds open and you can climb in from either side.
5 inches of foam both sides.

Bed frames I found at the community garbage bin, cut at welded them up, made some hinges which I need to extend a little due to the excess comfort foam :)
The wood sides, I dunno..... we'll see

Emt tubing for the poles, cheap. but very effective.

If you are in the States or better Australia you'd probably get a cheaper premade rooftop tent
locally and mod it to your needs.

I have work to do on this for this season and shall document my changes :)

This is great. I've been thinking about something like this for a while. More details please. How does it hold up in strong wind? Do you keep it attached all the time, or how easy is it to install/uninstall?