I've never seen a truck with these have a problem popping up in the rear but it is possible. It has to pull the rear shackel downwards to open. When a truck hits the brakes it pulls forwards and doesn't release. I like it for off-road rigs only.
Otherwise you can do the huge flex in the rear idea I wrote up earlier for the early broncos and I bet the big bronco can do it as well. Take a look, its under the tech write ups. "Huge flex in rear"