I'm planning to get the 5000SLX (the latest long model) for my 911SC. Should be fine, at this link you'll see the 5000SLX lifting a 911SC:
Pelican QuickJack Page
It's not obviously the 5000SLX, but if you view the video carefully at the end when they are picking up the QuickJack and stowing it against the wall, you can see a 5000SLX label on it.
Mark