They have one for the JKU, but my JKU build is done and I'm just kind of bored with it. I may keep my Jeep, not 100% set on selling it. Either way I want a Tacoma as a daily driver. There isn't anyway it'll work on the 4runner because the top isn't removable like it is on the Jeep.
I found this website
https://www.accordionboot.com/form.php which makes this product:
I believe I could make an aluminum ring patterned after the back glass that was held in with the window trim on the truck and also have a corresponding cut out on the Habitats forward bulkhead. The accordion boot would be easy to attach, it wouldn't damage the truck's paint, it would allow the frame to flex would be 100% removable since I'm not permanently altering the truck.