I had a lot of problems with struts on Magnum rear hatch. Got bonked in the head a few times. I replaced the originals with 'Strong Arm' brand. Good at first, but then within a couple years same deal. Even worse when cold. Did a couple sets of those. Eventually I got a pair online -brand was 'Sixity' Actually had enough lift to help push it up, not just hold. And didn't lose any strength in the rest of the years I had it.