trolley

Spent Sunday with the wheels off giving them a good clean and painting the brake calipers (well, only got two done :( ). I realised I should really be using axle stands and not the emergency jack, especially as I needed to rotate the rear wheels. So, where from? I'm not a mechanic and this...

Hi, Is it standard practice to use a trolley jack located under the diff to lift both rear wheels simultaneously? If done correctly, I assume this does not damage the diff. Thoughts? DB1