Viscous coupling check .. procedure

Gday ALL, any instructions please where exactly to safely position one
or more rolling jacks to lift the back wheels for the standard VC check.
Do I need extra equipment as well?

After checking the VC in G and/or 1st gear, depending on the results of
the check and for my own peace of mind, is there any problem also
checking the VC in Reverse? TIA. Cheers.

Ken