Vincent
I always carry a light weight Aluminium roller trolley jack in BEX333, (Ace Bristol) and as James and Robin State. Lift front on main cross member ( using a small block of wood to save damage to paint finish on chassis cross member.)
As my ali trolley jack has front roller it easily slides under a Ace /Aceca and Cobra, I can comfortably raise the rear by clearing the fuel Tank ( mine is Ali) small block of wood with pre drilled hole allows one to lift via the diff with the drain plug recessed into pre drilled hole.
Have used this method at home and on the road over the past 20 plus years... Would never use a bottle jack.
Speed and Safety First... Especially if on Motor way or in precarious location.
Out riggers are not suitable to use as jacking points.
Keith