Jacking on the rear beam is fine.
Then you carry on, I certainly won't be!
I jack the front up and the rear wheel comes too!
I jack the front up and the rear wheel comes too!
Never mind the bending thing, wouldnt imagine its very safe to balance it central on the beam even if its only for a few secs.
I use the beam for axle stands but wouldnt jack up in the middle of it. Just my opinion rather than right or wrong lol