FWIW I have no tie to those company, just saw it on the web and figured I would pass it along. I know a lot of people get frustrated with the wind resistance of a RTT and/or the expense. But by the time they done fitting out the bed of the truck with the gear they want there isn't enough room to sleep in it up against the ceiling of the cap. This might be an alternative worth exploring. A system that raises the cap of your truck and with the tent turns it into a larger space to sleep in. Just wanted to pass it along. It also might stimulate some ideas for some homemade versions using some camper jacks etc.
https://topperezlift.com/index.php/shop/
https://topperezlift.com/index.php/shop/