I would still put it on a 4runner, just want to get rid of the bulky 4runner tail gate.
He has two designs, one uses the factory rear glass and the one I have that attaches with velcro on all four sides. There is a metal strip that attaches to the four screws in the top of the tail gate that provides a velcro strip to seal the bottom. It's a slick design. You might be able to get adhesive velcro to stick to the tail gate and have him make the back window slightly taller.
By the way, you can see the sides and back rolled up in one of the pictures showing the shipped product. It's in one picture and removed in the other so it's fairly small.